from The Century Dictionary.
- noun An instrument for measuring the strength of an electric current by means of the attraction or repulsion mutually exerted by two coils of wire, through at least one of which the whole or a part of the current to be measured passes.
from the GNU version of the Collaborative International Dictionary of English.
- noun An instrument for measuring the strength of electro-dynamic currents.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun measuring instrument that uses the interaction of the magnetic fields of two coils to measure current or voltage or power
Sorry, no etymologies found.
Besides this, Siemens 'electro-dynamometer and Ayrton's voltmeter were used to check the results; but there was no practical difference discovered.
The number of Siemens machines and Siemens electric lamps, together with measuring instruments such as the Siemens electro-dynamometer, which has been supplied to different parts of the world by the firm of which he was the head, is very considerable, and probably exceeds that of any other manufacturer, at least in this country.