The practical telephone handbook and guide to the telephonic exchange (1906) (14753083601)

Identifier: practicaltelepho00pool (find matches)
Title: The practical telephone handbook and guide to the telephonic exchange
Year: 1906 (1900s)
Authors: Poole, Joseph
Subjects: Telephone
Publisher: New York, Macmillan Co.
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Boston Library Consortium Member Libraries



Text Appearing Before Image:
5o5 PRACTICAL TELEPHONE HANDBOOK Exchange, where this type of board has been installed. Certainmodifications have been necessary, however, to adapt it for
Text Appearing After Image:
Fig. 469.—Front View of Test Clerks Panel.(Reproduced from Electrical Engineering by permission of the Proprietors) more extensive junction working than is usually required (seeElectrical Engineering,.5th March 1808). Fig. 469 gives a front view of a test-clerks panel used in con-junction with these boards. This panel embodies all theprincipal features of the test-clerks desks used in connection SPECIAL EXCHANGE SYSTEMS 507 with large C.B. exchanges by means of which, the faulty lines,etc., can be tested and the troubles diagnosed and localised. W. E. Co.s No. 10 Switch-Board.—This is a C.B. board madeup in one-position sections similarly to the No. 9 but having allthe features of the regular No. 1 or Standard C.B. equipment—■that is, lamps are employed for calling and supervisory signals,and the Hayes system of repeating coils for the operators cordcircuits. On this board as much apparatus as possible hasbeen fitted on the section itself, and thus this type of board canbe ins