hddennis Posted July 31, 2020 Share Posted July 31, 2020 (edited) Just acquired this and would like suggestions as to what it might be and how to research it. It is a Jones Motrola type B class A tachometer. These can be found online in fitted cases with attachments to allow it to be a hand held device for measuring rpm. It normally has the ability to measure 3 different rpm ranges. My example has a single scale and is marked Maxwell Motor Company Inc. dating it to 1913 or later. I found mention of tachometer usage on Maxwell's 1914-15 factory race cars. If this is not an example of one of those racers tachometers then to my mind it has to be either a test instrument for use by the factory or a dealer used item. In 30 years of Maxwell parts chasing I've never seen another nor mention of it's use. Had it been the later 2 usages I'd have thought more than one would have survived. I welcome thoughts and suggestions. Howard Dennis Edited August 2, 2020 by hddennis (see edit history) Link to comment Share on other sites More sharing options...
TerryB Posted July 31, 2020 Share Posted July 31, 2020 Where does the input drive connect? Rear mounted like a speedometer? Link to comment Share on other sites More sharing options...
hddennis Posted July 31, 2020 Author Share Posted July 31, 2020 Terry, sorry I had duplicate pictures and they failed to show the drive off the bottom like the one in fitted case and like the models shown in period advertisement. Check out the edited post above. Howard Dennis 1 Link to comment Share on other sites More sharing options...
TerryB Posted July 31, 2020 Share Posted July 31, 2020 Looks more like a shop or factory test tool. Sure is unique. I had some old Starrett hand held tachometers but nothing like yours. Link to comment Share on other sites More sharing options...
hddennis Posted August 1, 2020 Author Share Posted August 1, 2020 I agree Terry. It was originally designed as such BUT this one no longer has the multiple scales because it was modified to just read one range of rpm. I would have thought the adjustable feature would have been more useful at the factory or a dealership. Howard Dennis Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now