The Electrical System gallery offers 159 illustrations of household wiring, switches, and other electrical elements. For electrical lighting, please see the Electric Lighting gallery.
"Edison fuse plug cutout for switchboard use." —Croft 1920
A safety device that protects an electric circuit from becoming overloaded. Fuses contain a length of…
A cupped-disc-gap protector.
A Garton-Daniels lightning protector.
Loss in a suction gas-producer plant.
A direct-connected generating unit. A high-speed piston-valve engine driving a small alternator.
Graphic record produced by General Electric Company's Type G demand meter.
Lamp ground detectors for two and three-wire circuits.
A ground wire over a three-phase transmission circuit.
Different views of a grounded metallic comb to relieve belt of static charge
A graphic definition of the term "head".
Boring holes around a bridge.
A horn-gap protector for air conditioner series lightning circuits.
Illustrating the nomenclature of the essential elements of a hydro-electric development.
Sectional elevation of a typical 110,000 volt hydro-electric generating station.
Impulse wheel and nozzle.
Determination of an average load imposed by an industrial plant.
End elevation of the control desk and instrument board.
Instrument post used instead of a panel switchboard.
A General Electric "hour glass" choke coil insulated for 35,000 volts.
Motor insulated on a parallel timber base.
Illustrating method of measuring insulation resistance
Testing the insulation resistance of an armature.
A two pole front connected knife switch fused at the handle end.
A three pole rear connected knife switch fused on the hinge end.
Showing the construction of a quick break knife switch.
Knopp test set for determining current in direct-current conductors.
Installation of Kuhlo wire in a residence.
A box with a lamp inside to demonstrate a galvanometer.
Incandescent lamps for exploring.
Showing leakage current through the frame of a machine which is insulated from ground.
Fixtures used in a Boston house wiring campaign. (Listed at consumer price). Fixtures sold in finished-building…
Illustrating the principle of the magnetic blow-out lightning protector.
A Pierce line wire, horn-gap protector.
A magnetic locator.
Installation of metal molding to serve brackets.
Testing the insulation resistance of a motor or generator from its winding to ground.
Alternating-current motor installation.
A method of mounting a box for a bracket fixture.
A multigap protector mounted on a pole for transformer protection.
A multipath protector in a wooden box for outdoor installation.
Section through a small, low pressure oil engine of the "hot-bulb" or "hot-ball" type.
Remote control oil switch in masonry-cell mounting.
The circulating oil-type transformer.
Supporting outlet box on a furred ceiling.
A panel box in a rigid conduit installation.
Examining a partition interior.
Finding the average load from a load graph with a planimeter
An Amsler-type polar planimeter that is being used to measure the area of a load graph.
An illustration showing the distribution losses in a small, alternating current central station.
A printometer-type demand meter arranged in a self-contained case for field tests.
Schematic connection diagram for a grounded-neutral, three-phase electrolytic protector.
Outdoor-type, cupped-disc-gap protectors on a three-phase line.
Grounded street railway circuit.
A current-limiting reactor.
Rear elevation of the switchboard with the perspective and front views.
A regulator for small, direct-current generators.
Rigid conduit inserted where the conduit is exposed to moisture.
A device when vibrates causes bells to ring.bell, acoustic device, signaling device