24mmX27mm Combination Wrench

[NoTrespassing]

Very interesting. I would have thought metric would be go to unit, given Germany and Japan make the high end stuff, so is the Whitworth thread common in the microscope sector or just in one supplier. Which microscope producers use Whitworth thread?

What is the unit on the "0.8"?

Always looking for quality British standard tools - gauges, tapes & dies. Koken, Stahlwille, and Gedore are my go to for quality British standard tools still being produced. Who are you aware of?

Olympus and Zeiss use RMS, I think Nikon, Leica, and Mitutoyo use metric.

The Royal Microscopical Society (RMS) is a learned society for the promotion of microscopy. It was founded in 1839 as the Microscopical Society of London making it the oldest organisation of its kind in the world. In 1866, the Society gained its royal charter and took its current name. Founded as a society of amateurs, its membership consists of individuals of all skill levels in numerous related fields from throughout the world.[5] Every year since 1841, the Society has published its own scientific journal, the Journal of Microscopy, which contains peer-reviewed papers and book reviews. The Society is a registered charity that is dedicated to advancing science, developing careers and supporting wider understanding of science and microscopy through its Outreach activities.

The Royal Microscopical Society (RMS) objective thread is a standard thread used in microscopy and photography, specifically designed to ensure compatibility between microscope objectives and lenses.

• The RMS thread is a Whitworth thread, with a pitch of 36 threads per inch and a nominal diameter of 0.8 inches.
  
  2
• It has a flank angle of 55 degrees and is standardized according to various international standards, including DIN 58888 and ISO 8038

 

[M59]

^ Much appreciated. Always interested in expanding my tooling knowledge.

 

[NoTrespassing]

Since we're on the subject of threads, has there been a discussion on TBN about the origin of the metric sparkplug thread and Albert Champion?

From Standard to Metric: The Evolution of Spark Plug Sizes and the Influence of Albert Champion

The fascinating history of spark plug sizes and the adoption of metric measurements in American cars and motorcycles.

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