Abstract: A self-contained water alarm for monitoring floor moisture comprising a plurality of pairs of sensor electrodes mounted at spaced locations on the bottom of a donut-shaped housing that can be fitted over a standpipe, the sensor electrode pairs being incorporated in feet that support the housing on a floor; the housing contains a horn or other audible alarm device, a battery, and an alarm circuit including an SCR having its main anode-cathode disclosure path connected in series with the horn and the battery and in parallel with a manual test-reset switch, and having its gate electrode connected to one sensor electrode in each pair, the other sensor electrode in each pair being connected to the battery. An auxiliary pair of sensor electrodes are connected in the circuit, in parallel with the housing-mounted sensor electrode pairs, to permit simultaneous monitoring of floor moisture and of the water level in a sump or standpipe. Provision is made for connecting a remote alarm to the device.

Abstract: A microfilm camera uses an instant imaging film, such as a vesicular film. Simultaneously with the exposure of the film, a small blip is recorded along the length of the film. On readout, the camera may be set to count the number of blips and thereby stop a searching reader at a preselected frame. The invention is primarily directed to a circuit for controlling the recording of the microfilm images and the blips on such instant imaging or vesicular film.

Abstract: A microfilm camera using an instant image film, such as a vesicular film, is herein disclosed. Instant developing stations and an associated read-out optical system are positioned in the path followed by the film as it travels through the camera. After the film is developed, its image is projected through the optical system onto a display screen. This way the operator may see the images immediately after they are formed on the film and rephotograph any defective image immediately.