Medbury overhead devices

[Trade Journal]

Publication: Western Electrician

Chicago, IL, United States
vol. 16, no. 16, p. 196, col. 3

Medbery Overhead Devices.


The greatest annoyance to practical electric railway linemen is the very unsatisfactory style of trolley wire clamp heretofore used. The Davids clamp furnished by the Fiberite company, manufacturer of the Medbery material, seems to have done away with all the objections made, and the roads now using this device claim that it is a perfect preventive of all the trouble experienced with other clamps. Fig. 1 shows the device, and it will readily be seen that it is so simple that the fastening can be made in a few seconds time. There is no soldering or even bending of the clamp necessary, and it is impossible for the wire to drop; in fact no emergency wagon is needed where this clamp is used. Fig. 2 shows the Medbery globe strain insulator, made in three sizes. The great strength and perfect adaptability of this device commend it to all practical construction men. Insulated with the Medbery material it is practically indestructible. A test made by Prof. Morton showed a resistance of 350,000 megohms and a breaking strain of 7,600 pounds. Over 7,000 of these insulators are in use in Chicago. The Medbery material is carried in stock by the Mason Electric Equipment company, 24 Plymouth Place, Chicago, which is the sole western selling agent for the Medbery specialties.


Figs. 1 and 2 Medbery Overhead Devices.



Keywords:Fiberite Company : Medbery : Trolley Insulator
Researcher notes: 
Supplemental information: 
Researcher:Bob Stahr
Date completed:February 16, 2009 by: Bob Stahr;