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May 4, 2023

Mystery Instrument

Now with the correct answer: the "AMBU Trouble Shooter"

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A lady sent me these pictures, they are of an instrument made by the American Bureau of Engineering in Chicago, USA. She inherited these from her forebears and would like to know what it is.

Click on the pictures to see the instrument in full resolution

Ambu meter inside top cover, click to see the big picture

AMBU-screw close up, click to see a high resolution image
AMBU Dial face, click on the photo to see it in full resolution

Close up of the dial, click to see in full resolution

Tyler Hepworth found the answer:

The mystery instrument is a circa 1919 combination voltmeter/ammeter used for troubleshooting electrical systems, ignition testing, and cadmium testing on batteries. It was marketed primarily toward repairmen in the automobile industry. The item was marketed along with a set of 14 instruction books encompassing 3000 pages that contained detailed instruction on locating and troubleshooting electrical problems, over 700 wiring diagrams, a 300 page book that covered every aspect of automobile batteries, and a set of cadmium test leads. The entire package was billed as the "AMBU Trouble Shooter". It sold for around $200 which is equivalent to about $1800 dollars today. Sources Sales documents at the end of the book "The Automobile Storage Battery: Its care and repair".

The book was digitized and made available by Google and includes the advertisement for this gadget.
http://books.google.com/books?id=1aQZAAAAYAAJ&pg=PA403&lpg=PA403&dq=ambu+trouble+shooter&source=bl&ots=6mtjS0evyQ&sig=4TjiZRBhlcpdh5CgGDTfxPal0Xs&hl=en&ei=5j-WS6D6J5KEswP9u_0_&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAgQ6AEwAA#v=onepage&q=ambu%20trouble%20shooter&f=false Price information obtained from "DeGolyer Librarian Acquisitions, 2008-2009: A Selective Checklist" pg 48. Appendix B, Item number 30. http://smu.edu/CUL/degolyer/pdfs/acq08-09.pdf

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