John Bates hopes that TATHS may be able to help the Traditional Tools Group in Sydney with an unusual micrometer.
A fellow TTG member recently sent details of a Carl Mahr micrometer.
His problem was that he did not know what the numbers stamped on the frame were.
It is an old micrometer my guess would be early 1900s. Metric graduations with a range of 0 to 35 mm by 0.01 mm. There are 10 sets of figures which are multiples of 7.78 – why?
Have attached a couple of photographs. Any assistance greatly appreciated.
John Bates
TTTG Secretary
Some further illustations provided by Wolfgang Jordan - see comments below
