dry battery

If all these alternatives are lacking there is the electric flash lamp working with the dry battery.

It was the same kind, made with the same storage dry battery, that ran his train and lighted the Teddy bear's eyes.

The Gassner dry battery polarizes much less quickly than the ordinary Leclanch.

A dry battery will do, but if you use the sounder much, an open-circuit battery will soon use itself up.

If you wish to use the buzzer simply to call some one occasionally, a dry battery or Leclanché cell is best.