1920's Tyrela gramophone - powered by steel @bhadeshia123

bhadeshia123 | 1920's Tyrela gramophone - powered by steel @bhadeshia123 | Uploaded August 2023 | Updated October 2024, 23 seconds ago.
This gramophone is made in the early 1920s, out of mahogany wood. It is hand wound (to store energy in a steel spring) and uses 78 r.p.m. records. The volume of the output can be controlled by opening and closing the doors. The steel-needle translates the topology of the grooves on the record, into vibrations that feed the the horn from which the sound can be heard.

Some microscopes work by scanning a needle extremely close to the surface of a sample, giving almost atomic resolution of the surface topology. The force between the needle and surface provides feedback to a piezoelectric crystal that actuates to maintain a very small, constant distance from the surface.

This particular gramophone belongs to Dina and Frank Abbott.

Sigma-phase in alloys of iron: crystal and microstructure

$Stress corrosion cracking and hydrogen embrittlement Dr Clayton Thomas presents at the Warwick Manufacturing Group Seminar organised by Prakash Srirangam. Stress corrosion cracking (SCC) and hydrogen embrittlement (HE) are part of a phenomena called environmentally assisted fracture, which causes the catastrophic failure of metals, at lower than expected loads. Hence over the years it has caused many engineering failures. Some of these failures will be discussed in this webinar, to illustrate how important it is to consider the phenomena when designing components and structures. The methods and standards used to prevent the problem will discussed, and show how they affect material selection and manufacturing. The similarities and differences between SCC and HE are considered and although many mechanisms of the phenomena are well understood, many are not and some examples of these will be discussed. SCC occurs in a range of materials and environments and some of the more common examples will be covered. Also, Hydrogen embrittlement covers a range of failures processes and some of these will be discussed. Hydrogen sulphide causes sulphide stress corrosion cracking, which is a major problem in the oil and gas industry. Hence it must be considered when designing equipment and it strongly influences both the material selection and fabrication and this will also be covered. About Clayton Thomas: Originally from South Wales and currently living in Barnsley, South Yorkshire. Clayton gained a degree in metallurgy at Imperial College, London, and then went to the University of Sheffield and attained a Masters degree in metallurgy (subject of masters thesis was the environmentally assisted fracture in a martensitic stainless steel) and a PhD, investigating offshore corrosion fatigue. He worked for three years at British Steel Technical (in Rotherham) as a metallurgical investigator and then corrosion test laboratory manager, and then joined Cameron (now called One Subsea) as corrosion engineer in 1990, who are a major supplier of oil and gas completion equipment. He eventually became senior metallurgist and worked on major topside and subsea projects, where he was responsible for the material selection and corrosion prevention for all topside and subsea projects and for the metallurgy and welding of equipment. Since 2000, he has have been the director of his own company, Lloyd-Thomas Consultancy Ltd, providing metallurgical support and training. He has continued to work in oil and gas as well as other engineering sectors, such as renewable energy, power engineering, aerospace and biomedical. He has carried out numerous failure investigations and have acted as an expert witness in litigation cases. He has also run over 300 metallurgy courses for companies and colleges on various aspects of metallurgy and an approved trainer for the AMRC, which is part of the University of Sheffield, as well as providing metallurgy training courses for the Institute of Materials, Minerals and Mining and the Engineering Training Institute of Australia.$

Crystallography, deformation & texture. Lecture 7 of 9

Prof Sir Harry Bhadeshia ASPPRC 40th Celebration Lecture: Visionary Steels

Molybdenum and niobium silicide based intermetallic alloys

Pure iron - the phase diagram - terapascal pressures, 20000 K

Freight train through Cambridge Central Railway Station