Society of Glass Technology · [Sheffield] · leaf 440
ply voltage being applied at opposite corners, througha variable rheostat as in the sketch. The remaining corners of thebridge are connected to a millivolt-meter, A, of 50 ohms andperiod f sec, which has the ordinary pointer replaced by acontact arm or boom moving between two contact studs.The boom… … Fig. 15. from the main supply, and to the right hand contact stud of Athrough the 150 ohm resistance, Rv A thermal Lamp Flasher,F, in the primary circuit, P, of an ordinary bell transformer (110/8 V)run from the supply mains, produces intermittent changes in thecurrent through P, with corresponding…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-388-170.webp)
