Light bulb tool ID

[RobH]

I just found an old tool that I think is light bulb related and I'm trying to find out exactly what it's for.  It's the first object on this page:

http://puzzlephotos.blogspot.com/2007/08/set-192.html

I did some searching on the web but couldn't find anything like it.


Thanks for taking a look.

[RobH]

Well, someone passed along the patent number for the device, so I'm happy to say that the answer has been found.  It's a vibration meter, patented in 1928, number 1,687,507; from the patent:

    One application of my invention is to the determination of the vibrations to which incandescent lamps and similar devices are subjected.


http://www.google.com/patents?vid=1687507

[Tim]

Thanks for sharing the information; it had me a bit baffled too.? Very interesting item!