Ticker Tape Timer
To provide dots on tape at 1/50 or 1/60 second intervals, equal to the frequency of the mains supply. Operates on 12 V ac. It has an electromagnet and a spring-loaded armature which vibrates above a support table. Paper tape drawn through guides on the table is struck by a dotting screw, carried on the armature. A peg on the table is provided to allow full use of carbon paper disc. Fitted on base with 66mm carbon discs (12) and tape roll small 15mm x 30 mtr.