3V, Battery. Timer operates on both 1.5 and 3VD-batteries, thus giving two different motor speeds, when required. The whole assembly is mounted on a flat base to reduce vibration & increase stability. Complete with carbon discs and tickertape. Optional stand no. 1819 for use with tape roll.
AC, low Voltage, Operates on 6-12V AC. Relative positions of tape and carbon discs can be adjusted for optimum use of carbon discs. Assembly mounted on metal base, providing stability.
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