Automatic typewriter : It is a power-driven machine, which automatically types a standard pro forma from a previously punched or stencilled master. When the master is placed on the machine and the machine is switched on, the matter is automatically typed on the paper at a speed of about 150 words per minute.

Non-standard information like names, addresses, etc., may be inserted at appropriate places by manual typing. Thus, it is suitable when letters or circulars bearing routine messages have to be reproduced in large numbers.