Abstract: A time fuze or detonating device for unpredictably-detonating scatter ammunition, which is activatable through the intermediary of an electrical trigger signal. The time fuze or triggering device is equipped with a cyclical counter which, in dependence upon a time period which commences upon the deployment of the scatter ammunition, is supplied with counting pulses, and wherein upon the appearance of a switching information, there is counted further from an end-count position momentarily reached in the cyclical counter, into a pregiven triggering count position for the emission of the trigger signal.

Abstract: A switching arrangement for the control of an adjustable member such as a valve includes a light sensitive switch. Detection of a particular light value enables a frequency divider to transmit an opening pulse to a valve control circuit a predetermined delay period after the detection of such light value. The frequency of an output signal of a pulse generator is varied in response to the opening pulse and the frequency divider transmits a closing pulse to the control circuit after a second predetermined time period of different duration from the delay period. In one disclosed embodiment, control of the frequency divider is responsive to moisture content of soil as well as ambient light level for application in automatic sprinkler systems.

Abstract: An electrically operable alarm provided for a clock and includes a clock operated switch for turning the alarm on at a selected time. The electrically operable alarm includes an oscillatory circuit which, when oscillating, causes the alarm to sound and when not oscillating, causes the alarm to be silent. A bistable sweep circuit is operatively connected to the oscillatory circuit and goes to a first condition when the clock operated switch closes and in which condition the alarm sounds. A manual switch is provided which, when open momentarily, will cause the bistable switching circuit to go to a second condition in which the alarm remains silent until the clock operated switch again closes the next day. The manual switch is adjustable for preventing the alarm from sounding when the clock operated switch closes.