TELEPHONE EQUIPMENT FOR LONG CARLE CIRCUITS 129 



ploying the proposed panel mounting method. Such a board will 

 occupy a floor space of about 10 square feet and will take care of about 

 600 jacks, corresponding roughly to a capacity of 60 jacks per square 

 foot. 



This hitter type of board is to be made up of a number of panel 

 units which arc to be assembled on two vertical supports. The prin- 

 cipal types of units to be provided for the purpose are the keyshelf 

 units, the jack mountings and the equipment panels which may be 

 combined together as desired to give the necessary facilities. 



Fig. 16 shows a typical keyshelf unit designed for the panel type 

 board. By constructing the keyshelf unit as a separate piece of ap- 

 paratus, it is expected to be possible to standardize the necessary 

 types of keyshelves to fit all ordinary field conditions and to specify 

 the desired type of keyshelf to go with any particular arrangement 

 or number of jacks. The number of keyshelf units of any given type 

 may be as desired for each installation, thus the proportion between 

 the jacks and the keyshelf equipment may be suited to each type of 

 office. 



Fig. 17 shows a typical arrangement of the jack equipment and the 

 mountings which are to be employed for the jacks. This type of jack 

 mounting will make it possible to mount the jacks on the same SUp- 



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Fig. 17 — Typical Assembly of Jack Mounts for Panel Mounted Test Board 



ports as the testing equipment. The mountings are to be attached 

 to the supports by fasteners, each occupying a vertical space of l^i 

 inches and drilled to fit the usual drillings in the supports. This will 

 permit the close association of the jacks with the desired testing ap- 

 paratus. It will also be possible, by this means, to use for the jacks 

 only such of the available vertical space as may be desired, the re- 

 mainder being used for other equipment, thereby effecting economy 

 in the use of the space. The arrangement is thus expected to be ad- 

 vantageous both in large installations, where, the various groups of 



