Inside Out Library · Explore
Scientific American, Vol. 78, No. 14 (1898) (1898)
leaf 4
th resistance lying in its normal condition its resistance is extremely is placing upon the market, such a complete set of coils of still higher resistance ; and as the sparks pro- high, often reaching 20,000 ohms, but when the key of wireless telegraphy apparatus that it will in all proba- bility… … mitter. constructed so as to give It is frequently desir- the most efficient kind of able to dispense entirely spark for the purpose, The with Morse signals, and © 1898 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 78, No. 14 (1898)
More like this
