Rare 1887 Antique Edison Swan Dynamometer Voltmeter
On offer today we have something that is exotic and historical in the form of a Rare 1887 Antique Edison Swan Dynamometer: No.19, designed by J.A.Fleming and C.H.Gimingham. This beautifully made meter was crafted by two brilliant minds. Fleming was a consultant for the Edison-Swan company and Gimingham their Works Manager.
They designed and released their meter on 24th Nov 1887, in the Journal of The Society Of Telegraph Engineers and Electricians, Volume 16, Issue 68, Pages 522-539. The article was entitled ‘On Some Instruments For The Measurement Of Electromotive Force and Electrical power.’
- Width: 12cm
- Depth: 12cm
- Height: 9.4cm excluding brass handle
The label on the top of the box reads:-
Fleming & Gimingham’s Patent Application
PONDERS END, LONDON
How it Would Have Worked
- Meter consists of two moving coils mounted at the end of an ivory or ivorine beam supported by an inverted steel cup with an indium, tipped post.
- When the lid is screwed down, a rod and lever tilt the coils on a pair of cloth lined cradles against the fixed coils.
- The balance pointer is viewed through an aperture in the centre of the nickel plated top plate. It is essential that the meter is levelled prior to use.
- The mica scale pointer is rotated until the balance index meets zero. The knob is then loosened, scale pointer reset to zero and tightened.
- When energised, the moving coil assembly rotates and balance is restored by dial rotation upon which the null point indicates the measured voltage.
A scarce and beautiful historical instrument indeed, which is being sold as a collectible for display purposes only. It is in good used cosmetic condition with some scuffs, scratches and blemishes on the face of the instrument and to the outer wooden box. It has not been tested.
Wonderful gadget for your vintage science and technology collection or as a movie prop or to display in a museum!
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