Brewster Trolley Insulator

[Trade Journal]

Publication: The Electrical Engineer

New York, NY, United States
vol. 11, no. 147, p. 208,212, col. 1,2



"Conventions come and conventions go, but an

'ad.' talks on forever."



ONE of the most important features in the installation of an electric road is the proper construction of the appliances for connecting the span and trolley wires. Objections have been made to the present means of holding the trolley wire, for the reason that it has been necessary in most cases either to solder the connections, which necessarily weakens the wire, or else to hammer together the sides of the clamp, which causes trouble and delay in adjusting the position of the insulator.


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The accompanying illustrations show the "Brewster clamp," made by the Electric Merchandise Co., of 11 Adams street, Chicago. Figs. 1 and 2 show the clamp, which is made of two sections of hard and tough brass riveted together with a steel pin. After the clamp has been placed upon the trolley wire and closed, the insulator is screwed down upon it, firmly holding the wire without soldering or hammering, and presenting a perfectly smooth surface to the trolley. Figs. 3 and 4 show the clamp attached to the standard trolley wire insulators, but the clamp can be used on any trolley hanger, and is sold either separate or in connection with any other style of insulator.

Mr. Mason, the general manager of the company, will be at the Providence convention, with this and many other specialties.


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Keywords:Trolley Insulator
Researcher notes: 
Supplemental information: 
Researcher:Bob Stahr
Date completed:January 25, 2011 by: Elton Gish;