Modern Fire Alarm Signalling

Issue 22 and Volume 79.

Modern Fire Alarm Signalling Master Clocks and Time Switches Description —Some of the Common Troubles and Remedies THIS is the fourteenth of a series of articles on the care, installation and repair of various phases of fire alarm work, The auther has had practicle experience in this field, and he will answer questions on this subject that are submited to him by the readers, free of charge. The only condition is that a stamped envelope must be enclosed for reply. Description The self winding type of master clock is the unit most frequently used for central office master clocks and it must be an accurate substantially built, self winding unit that is entirely automatic in its operation and also independent of batteries and varying local conditions. The International type D master clock is an ideal type of master clock to use in connection with the operation of time stamps, lights…

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