26-sided antique stone die Jaap Scherphuis 2022-11-19 | This antique gaming die was made in Zöblitz from the locally mined serpentine stone, probably between 1880 and 1910. It is a rhombicuboctahedron, so it has 26 sides. Only the 18 square sides are used. Twelve sides have the numbers 1 to 12, and six sides have letters. Two games are played simultaneously. The letters are for Put & Take, a game that goes back to the middle ages.For more information about this die, please visit my website:jaapsch.net/stuff/zoblitz.htm0:00 Introduction0:52 History1:46 Instructions8:39 Serpentine9:37 Carving10:21 Outro
The AEG KAL portable ticket machine Jaap Scherphuis 2022-11-04 | This AEG KAL ticket machine was used by the Dutch national railways in the 1970s. The ticket details are set with the input pins, and a turn of the crank then issues a newly printed ticket. It has a locked cartridge with a control copy of all tickets printed.For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:23 Input1:13 Printing a ticket2:07 Removing from the stand2:29 Counter registers3:33 Opening the case4:05 Control cartridge6:24 Ink roller6:53 Setting the date7:15 Print locking mechanism8:04 Print cycle9:20 Outro
The Olivetti Summa 15 adding machine Jaap Scherphuis 2022-10-22 | The Olivetti Summa 15 adding machine was made in Italy in the 1950s. Its most unusual feature is the multi-function button that looks like a joystick. For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, history1:06 Manual lever1:36 Paper feed1:53 Multi-function button2:30 Entering numbers, clearing input2:57 Addition3:15 Totals and subtotals4:05 Subtraction4:25 Non-Add function4:49 Button release5:08 Repeat, multiplication6:28 Ink ribbon7:05 Negative totals7:42 Serial number8:11 Outro
Precisa 102-1 adding machine Jaap Scherphuis 2022-10-08 | The Precisa 102-1 adding machine was made in Switzerland in the early 1950s. It has some quirks that you need to be aware of when using it, and its recall functionality is very unusual.For more information on this machine and others in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:51 Addition1:16 Totals and subtotals1:58 Subtraction2:25 Negative totals3:30 Non-add3:55 Non-print4:29 Repeat, multiplication5:34 Recall8:17 Crossbow logo8:50 Opening the case10:25 Printing mechanism11:01 Subtraction mechanism11:53 Non-print mechanism12:40 Reassembling case13:08 Outro
The Addo-X 341 adding machine Jaap Scherphuis 2022-09-25 | The Addo-X 341 is an adding machine made in Sweden in the 1950s. My version has a carriage for feeding paper sheets, but most just had a simple paper roll.For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:25 History1:35 Entering numbers2:00 Addition2:16 Subtraction2:50 Subtotals and totals4:20 Symmetric keyboard4:45 Multiplication5:55 Step-O-Matic6:54 Non-Add7:14 Carriage8:44 Addo-X 3519:33 Ink ribbon9:49 Power cord11:06 Outro
The Olympia AE-8 adding machine Jaap Scherphuis 2022-08-30 | The Olympia AE-8 is an adding machine from 1967. It is fairly unremarkable, with a standard keyboard and controls.For more information about this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:51 Addition1:17 Total/Subtotal2:05 Subtraction2:39 Negative totals3:09 Non-add3:29 Clearing3:38 Repetition/Multiplication5:02 Ink ribbon5:47 Opening case7:30 Power cord8:34 Inserting paper9:26 Mechanism in action10:59 Outro
The Summira S printing adding machine Jaap Scherphuis 2022-08-05 | The Summira S is a version of the Summira 7 adding machine but with a printer mechanism at the back. Pulling the large handle will cause the current input to be printed, either in black or in red depending on whether subtraction mode is selected.For more information about this and other calculating machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:19 Addition1:02 Clearing1:32 Multiplication2:23 Subtraction3:28 Printing6:20 Printing mechanism8:06 History8:34 Outro
Beaver adding machine Jaap Scherphuis 2022-07-15 | The Beaver is a very rare adding machine that was made in Japan in 1964. It was exported and sold by Ito-Ya Ltd., a stationery supplies company.For more information on this and other calculating machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:28 History1:44 Addition2:42 Subtraction4:25 Clearing4:48 Complementary numbers5:48 Opening case8:35 Mechanism11:02 Outro
The SCM 1011 CB adding machine Jaap Scherphuis 2022-07-01 | The Smith-Corona-Marchant 1011CB adding machine has a very distinctive styling in orange and brown.For more information about this machine and others in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, History0:45 Addition2:10 Clearing input, Non-add2:51 Subtraction3:55 Repeat, Multiplication5:00 More history5:59 Opening the case7:29 Paper roll7:55 Outro
The Precise adding machine Jaap Scherphuis 2022-06-18 | The Precise adding machine is a simple co-axial adder with a built-in stylus. It was made between 1946 and 1950 in Chicago, and despite its short production period it has a rather complicated history.For more information about this and other calculating machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:27 Addition0:54 Clearing1:22 History1:41 Precise Developments Co.2:54 E.C.A.5:25 Tastee-Freez7:01 Outro
The Multo mechanical calculator Jaap Scherphuis 2022-06-03 | The Multo calculator was made in Sweden from 1949 till 1966. It is a model 3, so it has an input display but no back transfer.Here is a link to @rubberswan's channel with Multo disassembly videos:youtube.com/user/rubberswan/videosFor more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:30 History1:01 Nice touches1:38 Addition1:48 Counter2:24 Multiplication3:06 Clearing4:00 Seizing up6:17 Further history7:22 Outro
The Everest Plurima Manuale adding machine Jaap Scherphuis 2022-05-20 | This adding-listing machine was made by Serio in Italy from about 1960 till 1965. It is manually driven, and handles subtraction and negative totals.For more information about this machine and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:20 Input0:40 Addition0:55 (Sub)total1:59 Non-add2:24 Subtraction2:50 Negative totals3:31 Multiplication4:50 Ink ribbon6:20 Opening case7:05 Outro
The Brunsviga 11S mechanism in action Jaap Scherphuis 2022-05-10 | This shows the Brunsviga 11S mechanical calculator without its case, calculating 355 divided by 113.Main video demonstrating the Brunsviga 11S:youtube.com/watch?v=1wtOBqjVHyAFor more information on this and the other calculators in my collection, please visit my website:jaapsch.net/mechcalc
The Brunsviga 11S mechanical calculator Jaap Scherphuis 2022-05-06 | The Brunsviga 11S is an electrically driven mechanical calculator. It is similar to the Brunsviga 11E but with a full keyboard instead of input pins. It has automatic division.Video of the mechanism:youtube.com/watch?v=5unqPg0UtWYFor more information about this machine and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:21 History1:32 Addition2:13 Subtraction2:30 Clearing3:04 Multiplication4:52 Division6:20 Outro
The Everest Z5R calculator Jaap Scherphuis 2022-04-22 | The Everest Z5R is a mechanical calculator made in Italy in the 1950s. It was made by S.A. Serio in Crema. The design is generally similar to the Facit TK, so it uses a pinwheel mechanism, has a 10-key keyboard, and an internal carriage.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:17 Inputting numbers0:43 Addition0:55 Multiplication1:37 Subtraction1:47 Shortcut multiplication2:19 Clearing2:37 Counter direction3:45 Division6:47 Back Transfer8:43 History10:24 Outro
The Summira 7 adding machine Jaap Scherphuis 2022-04-09 | The Summira 7 is a small adding machine. It can do direct subtraction, and was made in West Germany from about 1955 to the mid 1970s. It is very similar to the Resulta.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:18 Addition1:07 Clearing1:55 Small multiplications2:33 Subtraction3:53 History4:42 Outro
Otis Kings Pocket Calculator Jaap Scherphuis 2022-03-25 | Otis King's Pocket Calculator is a cylindrical slide rule. It was made from about 1922 till the early 1970s. This is a model K from the early 1960, which has just two logarithmic scales which allow you to multiply or divide.For more information about this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:31 Description2:09 Multiplication, Division5:18 Otis King6:04 Carbic Limited7:32 Outro
The Countess adding machine Jaap Scherphuis 2022-03-11 | The Countess adding machine is a very simple adding machine for British currency. It only does addition, not subtraction. It was made by Summira in Germany in the 1960s or early 1970s.For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:14 Columns for currency1:11 Clearing1:45 History2:50 Opening the case3:38 Carry mechanism5:48 Outro
The Russian Felix M calculator Jaap Scherphuis 2022-02-25 | The Felix M is a pinwheel calculator made in Russia from 1929 till 1978 with virtually no change in its design. It is closely modelled on the pinwheel calculator made by Odhner in St. Petersburg before the Russian revolution, because Odhner's machinery was confiscated and used to set up production of the Felix. Millions of these calculators were made.Errata: The first Felix was probably made in 1929, not 1928, and my Felix-M was probably made in 1976, not 1975.For more information about this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:44 The design, addition1:05 Clearing registers1:57 Counter, subtraction2:42 Input clearing3:11 Reversing direction4:10 History5:28 Felix Dzerzhinsky8:08 Outro
The Precisa 364 adding machine Jaap Scherphuis 2022-02-15 | The Precisa 364 is an adding listing machine that can also do multiplication. It was made from 1963 to 1978. The Precisa 160 is the same but without the multiplication functionality.For more information about this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, Precisa 1600:41 Precisa 3641:42 Addition2:15 Subtotal2:46 Total3:10 Subtraction4:11 Non-add4:45 Repeated addition5:04 Clearing input5:15 Repeated subtraction6:14 Multiplication7:08 Negative multiplication7:36 Squaring8:21 Shortcut multiplication9:00 Repeated multiplication10:45 Opening case12:10 Outro
The Hasbro Adding Machine Jaap Scherphuis 2022-02-03 | This is a toy adding machine made by Hasbro in about 1961. It is similar to the Wolverine, but plastic instead of metal.For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:19 Unboxing0:44 Description1:10 Addition2:00 Totals bar2:25 Clearing3:35 Mechanism6:19 Patents6:49 Outro
The American Adding Machine Jaap Scherphuis 2022-01-26 | The American Adding Machine was made from about 1913 till 1922 by the American Can Company, and for a short while after that by The American Adding Machine Company. The one I show here is the earliest model, which has a gorgeously patterned case.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, History0:54 Input mechanism1:32 Addition2:15 Clearing2:55 History5:22 Outro
The first and the last Sumlock calculator models Jaap Scherphuis 2022-01-15 | The Sumlock was made by Bell Punch in the UK from 1940 till the late 60s. It is used exactly like the Comptometer. Here is the first model (1940-1945, made by subsidiary London Computator Corporation) and the last model (1953-1970).Errata: There are of course 20 shillings in a pound, not 19.For more information about this machine and others in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:22 British currency1:22 Error detection2:47 Model 913!?4:22 Model F or SF4:55 Error on new model6:00 Outro
The Sumlock mechanical calculator, and some advanced calculation techniques. Jaap Scherphuis 2022-01-08 | The Sumlock was made by Bell Punch in the UK from 1940 till the late 60s, but these two were made in the early 1950s. They are used exactly like the Comptometer. After a short demo, I show how to multiply the register result by another number, and explain division in a bit more detail.For more information about this machine and others in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:26 History0:59 Overshoot prevention1:40 Error detection2:31 Models2:58 Multiplication4:59 Division9:50 Outro
The Mercedes Euklid 16 mechanical calculator Jaap Scherphuis 2021-12-29 | The Mercedes Euklid 16 is a mechanical calculator that was in production from 1927 till about 1935. The Euklid machines use a unique proportional lever mechanism. This model was the first to use a modular keyboard with tightly packed cubical keytops. It can do automatic division, and has a neat automatic decimal point system for multiplication.I also have videos of the later Euklid model 29:youtube.com/watch?v=aVFtFHLIrYMVideo showing the mechanism:youtube.com/watch?v=nsUWe9KkR8AFor more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:21 Keyboard1:00 Crank1:31 Addition2:30 Subtraction3:12 Clearing3:29 Multiplication4:48 Decimal points6:35 Automatic division9:05 Serial number9:44 Outro
The Victor 16-83-54 Adding Machine Jaap Scherphuis 2021-12-18 | The Victor 16-83-54 Adding Machine was made from 1960 till about 1967. It is very similar to the series 6, with a full keyboard, except that some of the controls have moved and are now buttons on the keyboard. This version has an electric motor. I forgot to show subtraction in this video, but that is the same as addition except that you press the minus button.Here is a previous video about the Victor series 6 and 7 adding machines:youtube.com/watch?v=Zlh6DEHwe9kFor more information about this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc
A short history of the Comptometer Jaap Scherphuis 2021-12-04 | I gave a 10 minute talk at the Gathering for Gardner 12 conference in 2016:"Before electronic computers and calculators, there were mechanical calculating machines. The Comptometer was one of the most widely used calculating machines, used all around the world for almost 80 years. It quietly changed the world, yet is almost forgotten today."This video was a practice run I made to see if I got the timing about right. The actual talk was filmed, and can be found here:youtube.com/watch?v=Q2G-383ij8AThe powerpoint presentation can be found here:jaapsch.net/g4g/index.htmFor more information about the Comptometer and the other mechanical calculators in my collection, visit my site:jaapsch.net/mechcalc
The Elm City Counter Jaap Scherphuis 2021-11-20 | The Elm City Counter is a simple counter, mostly used in the printing and textile industries. It was first made in the early 1880s, but ones like this one that have "C. J. Root Co." on the front were made after 1907. In 1928 the company merged with Veeder to become Veeder-Root, and the inscription of the Elm City Counters were changed appropriately. Production continued at least through the 1930s.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, History3:05 Description6:01 C. J. Root8:00 Mechanism10:06 Outro
The Sirius adder Jaap Scherphuis 2021-10-31 | The Sirius adder was made Master, who also made the Master and the Business adders. This one has attachments for use in multiplication and even division, but these are completely unusable. The box contains not only instruction manuals, but also various ads, including rather oddly an ad for the Sirius itself.Video of the Business and Master adders:youtu.be/m3toHgmCZukFor more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:53 Addition1:33 Carry operation2:14 Clearing2:39 Scriptor attachments6:52 Testimonials7:22 Sirius ad7:45 Guarantee8:24 Scriptor instructions8:52 Special offer9:32 Instruction booklets10:54 Ad for Electric Master11:35 Receipt12:04 Packing up13:14 Outro
The Triumphator CRN2 pinwheel mechanical calculator Jaap Scherphuis 2021-10-08 | The Triumphator CRN2 mechanical calculator is a rather large pinwheel machine. It was in production in Leipzig, East Germany, from 1959 till about 1965.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc
The Multifix E1R mechanical calculator Jaap Scherphuis 2021-09-24 | The Multifix E1R mechanical calculator
The Brunsviga D 13Z/1 double calculator Jaap Scherphuis 2021-09-17 | The Brunsviga D 13Z/1 consists of two calculators, side by side, connected to a single crank. Double calculators like this were used for calculations involving coordinates, such as land surveying, and were also often used by the military. I give a simple example of such a calculation.For more information about this and other calculators in my collection, please visit my website:http://www.jaapsch.net/mechcalc0:00 Introduction1:14 Uses for double calculators2:50 Description of the calculation, part 13:36 Doing the calculation, part 15:24 Description of the calculation, part 26:19 Clearing counter and input registers7:07 Doing the calculation, part 29:43 Clearing the output registers9:56 Manually setting the output registers10:28 Outro
The Denominator, a pay roll adding machine Jaap Scherphuis 2021-09-10 | The Denominator is a rare adding machine that simply contains a separate counter for each denomination of US currency. You would go through a stack of pay slips, entering the coins and bills needed for each one, so that at the end you'd know how many coins and bills to take out from the bank to pay your staff. The Denominator Adding Machine Company was founded in 1914 by Frank H. Morse to make this machine. The company still exists today, now called the Denominator Company, and is still making mechanical counters.For more information an this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:24 What it is used for0:54 Company history3:21 How to operate it3:45 Serial number4:08 Production4:39 Opening the machine6:22 Mechanism7:55 Repairs9:23 Outro
Rare Lipsia Addi 7 adding machine with printing mechanism Jaap Scherphuis 2021-09-03 | The Lipsia Addi 7 was released in 1930, but this variant with a printing mechanism was not success and is therefore quite rare. After the second world war Lipsia was merged with Triumphator, and the Addi 7 was given a makeover and released as the Triumphator KA.Video of the Triumphator KA: youtu.be/OqqCV5xh3-AFor more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc
The Precisa 117 mechanical calculator Jaap Scherphuis 2021-08-29 | The Precisa 117 is a pinwheel calculator with a 10-key keyboard, clearly inspired by the Facit calculators. Its main register and counter are stationary while the input register is on a moving carriage. It was made from 1952 until about 1963.For more information this and other calculators in my collection, please visit my website:http://www.jaapsch.net/mechcalc0:00 Introduction0:33 Addition1:35 Clearing2:15 Subtraction2:28 Multiply3:17 Division5:16 Precisa history6:44 Serial number7:02 Outro
A steam engine revolution counter Jaap Scherphuis 2021-08-14 | This antique revolution counter was very likely used with a steam engine, and probably made in Germany in the 1880s or 1890s. It has an unusual eccentric gear mechanism to drive the units wheel, and is one of the first counters to use the carry mechanism that is in use in almost all odometers made today.Further research leads me to believe that this counter was made by Schäffer & Budenberg in Buckau.For more information on this and the mechanical calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:48 Carry mechanism1:12 Eccentric gear drive1:57 Reset mechanism2:23 History - Eduard Stalmann, Buckau3:46 Outro
The Facit CA1-13 fully automatic mechanical calculator Jaap Scherphuis 2021-08-06 | The Facit CA1-13 is a fully automatic electromechanical calculator. Facit made their first fully automatic calculator in 1945, and that evolved into this model which appeared in 1956 and was produced until the early 1970s. As well as the three visible registers it has an internal register used to store the first factor in a multiplication.I apologise for the wandering focus of my camera.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:37 Addition1:08 Clearing1:28 Semi-automatic multiplication3:06 Subtraction4:24 Automatic carriage shift5:38 Automatic multiplication8:14 Division9:52 Aborting division12:09 The NEG button13:03 Outro
The Sterling Dial-A-Matic adding machine, 6-dial model Jaap Scherphuis 2021-07-30 | This Sterling Dial-A-Matic adding machine is a simple rotary adder with six dials and a clearing lever. It was first produced in the mid 1950s.For more information this and other calculators in my collection, please visit my website:http://www.jaapsch.net/mechcalc0:00 Introduction0:10 The box0:58 Models1:19 Stylus1:37 Addition2:14 Clearing4:08 Subtraction5:05 Outro
The Schubert DRV mechanical calculator Jaap Scherphuis 2021-07-23 | The Schubert DRV is a very well-designed pinwheel calculator. It was in production from 1952 till the 1970s. The controls are set up so that they can be used with one hand, and designed to need minimal effort. It was designed by Emil Schubert, who had previously co-founded and run Thales.For more information on this calculator and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:20 Addition0:46 Multiplication, shifting the carriage2:11 Clearing4:34 Back Transfer5:25 Serial number5:59 History, Emil Schubert8:03 Models9:29 Outro
The Ken+Add adding machine Jaap Scherphuis 2021-07-16 | The Ken+Add is a small dial adder, built into a nice metal case that also contains the stylus. It was named after its designer, Kenneth Pangburn, and made from 1950 until about 1958 or so. It used to have a "Magic Slate" inside the lid of the box, which was a waxy rubbery backing with a plastic semi-transparent film laid on top that you could draw on with the stylus. Peeling up the plastic sheet would erase the drawing.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:32 Addition1:30 Subtraction1:55 Clearing2:26 History3:20 Magic Slate4:15 Patents4:40 Similar machines5:09 Outro
The Antares P4 mechanical calculator Jaap Scherphuis 2021-07-09 | The Antares P4 is a pinwheel calculator made by the Italian company Organizzazione Pozzi in the 1950s.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 History0:20 Models1:55 Addition2:11 Counter2:35 Clearing3:09 Serial number3:45 Colours4:15 Further history4:58 Outro
How the Original Odhner pinwheel calculator works Jaap Scherphuis 2021-07-03 | I'll show and describe how an Odhner pinwheel calculator works. It is an Original Odhner model 24.For more information about this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:29 Pinwheel1:14 Carry mechanism3:27 Latch4:26 Input clearing mechanism7:00 Counter increment mechanism10:45 Counter carry mechanism13:34 Back transfer mechanism15:20 Input display mechanism16:02 Outro
The Original-Odhner 24 mechanical calculator Jaap Scherphuis 2021-07-03 | The Original-Odhner model 24 is a mechanical calculator with a pinwheel mechanism. It has a large capacity of 20 digits, and a back transfer mechanism. It was made in Göteborg in Sweden from 1940 (or maybe a bit earlier) until about 1948.In 1875 Willgodt Odhner made the pinwheel calculator that was the ancestor of almost all pinwheel machines that came after it. He died in 1905, after which his sons took over his calculator production business. It was they who moved to Sweden when the business was taken over after the Russian revolution (NOTE: In the video erroneously imply that Willgodt moved to Sweden).For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:19 History2:10 Addition2:42 Subtraction2:57 Clearing register and counter3:07 Multiplication4:17 Clearing input5:25 Counter6:13 Division8:02 Main carry mechanism9:27 Counter carry mechanism10:13 Back transfer mechanism11:36 Outro
The Calculator adding machine Jaap Scherphuis 2021-06-18 | The Calculator adding machine was made between 1915 and 1922, at which point it was replaced by the Lightning Calculator. It is almost identical to the Bonham & Schram calculator from 1905.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 History1:02 Stand and stylus1:18 How to use2:50 Stand and stylus3:35 Further history4:02 Outro
The SIMEX Caroline adding machine Jaap Scherphuis 2021-06-11 | The Caroline is a simple adding machine originally made by Simex. The one shown here is the more common French licenced copy. It was made in the 1960s. It's mechanism is very similar to the Addipresto/Addimat.Addimat video: youtube.com/watch?v=hIuxwschXg0For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 History1:15 How to use1:56 Carry mechanism2:16 Clearing2:34 History3:22 Mechanism6:13 Outro
The Melitta VII/16 pinwheel calculator Jaap Scherphuis 2021-06-04 | The Melitta VII/16 is a mechanical calculator with a pinwheel mechanism, which was made in East Germany from 1955 till at least 1963. It has a unique input mechanism with input pins that remain stationary when you turn the crank.For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:18 Input mechanism1:34 Addition, multiplication2:48 History6:41 Clearing7:30 Division9:54 Back transfer11:44 Carriage release12:30 Outro
The Madas Portable 12e mechanical calculator Jaap Scherphuis 2021-05-30 | The Madas Portable 12e is a mechanical calculator made by H. W. Egli in Switzerland from 1931. Versions of this machine were made until the late 1960s. This is the simplest electric model, and most later machines were much more automated. Even though this model is electric, shifting the carriage is still done manually. For this reason it has no fully automatic divisionFor more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 History1:50 Addition2:24 Subtraction2:42 Clearing2:49 Multiplication4:32 Division6:53 Manual crank7:32 Removing carriage8:08 Serial number8:34 Outro
The Madas BZS mechanical calculator Jaap Scherphuis 2021-05-22 | The Madas BZS is a mechanical calculator made by H. W. Egli in Switzerland. The first version of the Madas Portable is from 1931, but this fully automatic one is from about 1960. It has fully automatic division and multiplication. Note however that I have not been able to get the multiplication working, as it seems that some parts deep inside are stuck together and I have not yet dared to take it apart far enough to reach those parts.For more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:16 Addition0:41 Subtraction1:03 Semi-automatic multiplication2:04 Clearing2:22 Division3:42 Tabulation4:55 Aborting division6:25 Counter direction7:00 Setting multiplier8:06 Automatic multiplication9:12 Carry mechanism10:24 Split register11:10 Decimal markers11:40 Outro
The mechanism of the EOS mechanical calculator Jaap Scherphuis 2021-05-08 | The EOS calculator is identical to the Hannovera CK calculator. It uses an oscillating segment system somewhat similar to the Demos, but whereas the Demos uses complementary digits for subtraction, the EOS allows you to simply turn the crank in the opposite direction like a pinwheel machine. About 1000 were produced, and sold in Switzerland.I demonstrate the EOS in the following video: youtu.be/_bmuSqlPrL8For more information on this and other calculators in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction0:39 Addition cycle3:28 Subtraction cycle5:11 Oscillating mechanism5:40 Counter mechanism7:07 Automatic input clearing7:52 Clearing output register8:17 Cam wheels9:24 Outro
The EOS mechanical calculator Jaap Scherphuis 2021-05-08 | The EOS calculator is identical to the Hannovera model CK, but was made for the Swiss market. It uses an oscillating toothed segment mechanism which was easier to manufacture and did not infringe on Brunsviga's patents, unlike Hannovera's previous models which were pinwheel machines. The mechanism is similar to that of the Demos, but better because it can do subtraction by turning the crank in reverse.I show the mechanism of the EOS in another video: youtu.be/pWOyLou-uysFor more information on this and other machines in my collection, please visit my website:jaapsch.net/mechcalc0:00 Introduction, History1:28 Addition2:58 Subtraction3:21 Counter3:50 Clearing4:20 Shifting the carriage5:39 Serial number6:52 Outro
