ClipArt ETC
Fuse protection for voltmeter and ground detector on a direct-current switchboard. Fuse protection on instrument circuit of an alternating-current switch-board.

Fuse protection

Fuse protection for voltmeter and ground detector on a direct-current switchboard. Fuse protection on…

"Illustrating fuse protection for voltmeter and ground detector and ground detector on a direct-current switchboard." —Croft 1920

Fuse Protection on Direct Current Swtichboard

"Illustrating fuse protection for voltmeter and ground detector and ground detector on a direct-current…

"Illustration shows a voltmeter ground detector." —Croft 1920

Voltmeter Ground Detector

"Illustration shows a voltmeter ground detector." —Croft 1920

"Illustrating method of measuring insulation resistance." —Croft 1920

Measuring Insulation Resistance

"Illustrating method of measuring insulation resistance." —Croft 1920

A three phase circuit and voltmeter ground detector.

three phase circuit

A three phase circuit and voltmeter ground detector.

Voltmeter test diagram for open-circuited field.

Voltmeter

Voltmeter test diagram for open-circuited field.

Voltmeter test diagram for short-circuit between coils.

Voltmeter

Voltmeter test diagram for short-circuit between coils.

"Showing method of connecting voltmeter to find potential differnce between any two points as m and n on an electrical circuit." -Hawkins, 1917

Voltmeter

"Showing method of connecting voltmeter to find potential differnce between any two points as m and…