[X001M3216], Letter from Wilson Stout Howell to Bergmann & Co, December 6th, 1888


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[X001M3216], Letter from Wilson Stout Howell to Bergmann & Co, December 6th, 1888

Editor's Notes

Bergmann & Co., Testing Board A.A.A. replacement "sprint Jacks" or contract springs to receive municipal plugs as on circuit boards B, is a pair of #14 R.88.G wires. The upper wire is connected to the upper row of contact springs. The lower wire is connected to a #233 socket (or its equivalent) the other wire of the of the socket to be connected to the nearest contact plug on the lower row. The contact springs to be spaced same as on municipal circuit boards. The length of the board to be equal to the width of 9 municipal circuit boards placed 70 spent to which 5" is to be added at each end to fasten to frame Each pair of spring contacts should be spaced same as on municipal circuit boards when set side by side 5/8 spares the first pair commencing 5" from end of board and the last ending 5" from the other end, in the same manner on each of the two boards. Insulation should be made safe for 250 volts between the two wires B. Width of board to be same as width of slate shield at bottom of municipal circuit boards sent to Chester. Thickness of board to suit conditions of manufactures. Wires B., to overlap each end of board 12" for connections. Nine sockets and corresponding spring-contacts to be each board space as above. Wilson S, Howell, Chester Co., Dec. 6 '88





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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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