when not collecting clocks...

novicetimekeeper

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I also collect scientific instruments.

This turned up today. It is my earliest induction coil and my smallest. It seems to have cotton insulation, so not as early as silk, but that red finish is usually early.

The cabinet maker who restores my clock cases says it is Victorian mahogany work.

s-l1600 (1).jpg
 

novicetimekeeper

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A scientific equipment dealer I know has looked at it and says 1850-1870, in the second half of that period.
 

zedric

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What would this one have been used for? I assume the smaller the size, the lower the voltage, so not a transmitter or x-ray device?
 

novicetimekeeper

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It's a medical coil, used for treating all sorts of ailments. (pre NHS, and pre Tesla, Hertz, and Marconi)

The later ones have capacitors in the base and often segmented secondary coils connected in series. I have a number of the larger ones and also a couple more medical ones, but this is my earliest.
 
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Rockford's early high grade movements by Greg Frauenhoff