Publication: Western Electrician
Chicago, IL, United States
Insulating Hanger for Arc Lamps.
The hanger shown in the accompanying illustration is designed for insulating arc lamps, when suspended outdoors, exposed to the elements, where high insulation, strength and durability are required, and fully covers the rules of all boards of fire underwriters. The ball is make of the toughest green glass, three inches in diameter, with two grooves running partway round the ball at right angles. To this is attached interlocking loops, made of seven strands of galvanized steel wire, dipped in P. & B. insulating compound, thereby insuring high insulation.
To either end of the steel wire loops are fastened malleable iron castings, provided with eyes, on one of which is hung a switch hook, on which the arc lamp is suspended, thereby insuring ease of suspending and disengaging the lamp. Above the hook is a cross arm, also of malleable iron, one foot wide, on the ends of which are glass insulators for the suspension of the conductor wires to the lamps, thereby doubly insulating the lines before entering the lamp. The insulator will stand a strain of 6,000 pounds and will withstand extreme changes of weather without deterioration. For strength and fine appearance the hanger is not excelled. The device is exploited by the Metropolitan Electric company of Chicago.