Uploaded October 2021 | Updated September 2026, 4 hours ago

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The Sirius adder was made by 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/m3toHgmCZuk

For more information on this and other machines in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:53 Addition
1:33 Carry operation
2:14 Clearing
2:39 Scriptor attachments
6:52 Testimonials
7:22 Sirius ad
7:45 Guarantee
8:24 Scriptor instructions
8:52 Special offer
9:32 Instruction booklets
10:54 Ad for Electric Master
11:35 Receipt
12:04 Packing up
13:14 Outro