The Warner Cut-Meter is a magnetic driven tachometer used to obtain the speed of a machine tool such as a lathe. When cutting certain materials it is desirable to know the speed of the machine, which this tool provides in a measurement of feet per minute. The principals are similar to those of the speedometers used in the first automobiles. The body is constructed of brass and nickel plated, while the handle is polished tropical hardwood. The internal shaft rides upon sapphire jewel bearings for low friction. It dates to sometime around 1904 and was apparently very well built because only the nickel plating seems to have worn. The rubber O-ring was replaced, having long ago rotted away.
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Those were originally for belt operated machinery in factories powered by a steam engine, sometimes straight water power. Since the steam engine powered the whole factory or shop, they had to rely on pulley and gear ratios to control speed. I have a tachometer someplace, I think it’s a Starret, it works with a slightly different design then the one that you have in that it has a rubber tip on the end rather then a wheel.
Comment by Arran November 9, 2009 @ 10:01 pm