I recently obtained an old Lufkin depth micrometer no. 212, and I have some questions/problems with it:
Patrick
- the lock nut doesn't work. Is there any way to fix it? I don't see how I can dissassemble it
- the adjustment wrench is missing. It's a friction wrench as you can see in the bottom right in the picture below (picture taken from Lufkin catalog no. 7). I can't find this part anywhere separately. Do you guys have any useful pointers?
- How can I find out approximately how old this thing is? There is a piece of paper glued to the inside of the cover of the wooden box, mentioning "PATENTED AUG. 1ST, 1922 JAN. 5TH, 1926" so my first idea was that it dates maybe from the late 20's or early 30's but this micrometer must have been produced during a long period because it is listed in successice lufkin catalogs, from no. 7 (I don't have an earlier one) up to no. 9 (I don't have no. 10), and no longer in no. 11. There are no dates in the scans of these catalogs.
Patrick