Special Features:

Pneumatic, timing range 0.20 to 60 seconds, 300 volt cartridge type relays, converts on delay action to off delay action by reversing unit

Properties:

An item which actuates included electrical contacts and/or switches in an orderly succession, and at a predetermined interval(s) for the purpose of controlling the operation of another electrical device(s). May have provision for manually establishing an operational sequence or cycle. See also relay, motor driven; timer, interval; keyer (as modified); chronometer, make-break circuit and intervalometer (as modified).