One field is energized to cause the motor to run, and the other is energized to stall the motor a variable time after the first, depending upon the amount of deflection of the pointer from a mid-position. This
2. A camera for use with a power supply providing a supply voltage; said camera comprising an electrically controlled shutter means adapted to operate from the power supply; an acoustic indicator; a first switch; a supply voltage decision circuit adapted to be selectively connected across the powe...
indicate the position of the Earth's terminator, the circle and the sphere being arranged to be able to pivot with respect to each other along two perpendicular axes, a first of the two axes, referred to as the polar axis, corresponding to the polar axis of the terrestrial globe, and ...
and means converting said generated signal into an output having an amplitude proportional to the frequency of said generated signal; wherein said detecting means includes means switching from a first of said converting means to a second of said converting means to vary the speed at which said ta...