Abstract: A laser power meter is described which enables the direct measurement of the output power of lasers over a full range of differing beam wavelengths. The laser power meter includes not only the photocell for intercepting a laser beam and the needle-scale meter conventionally provided, but also calibration means for simple adjustment of the meter to provide a correct power reading irrespective of the wavelength of the beam whose power is being measured. The calibration means includes first and second pluralities of resistors which are selectively connected in series between the photocell and the needle-scale meter by switches which are calibrated in nanometers. A user of the device is able to obtain a true reading of the power in a laser beam merely by "dialing in" the wavelength of the beam and selecting the proper power range for the needle-scale meter.

Abstract: A device is described for indicating the thermal history of a product, i.e., whether or not such product has thawed and then been refrozen. The device includes a housing which is secureable in good thermal contact to the exterior of a package containing a frozen product. The walls of such housing insulate the same from the environment surrounding the package, while at the same time assuring good thermal contact between such interior and the product within the package. A closed membrane is positioned within the housing for containing a diffusion agent, and a wickable material extends from such membrane to a plurality of transparent windows in the wall of the housing. A dam extends across the wickable material to separate the closed membrane from such windows in a manner controlling diffusion of the diffusion agent through the wickable material.

Abstract: A sewage septic tank is described having a diversion system for diverting effluent from the tank from one drain field to another. A "Y" is provided on the outlet pipe of the tank to enable the effluent from such tank to be directed to either one of two drain fields. A gate valve is provided at the end of each arm of the Y to allow flow within the drain field associated therewith to be controlled. Thus, the effluent from the septic tank can be periodically diverted from one drain field to another so that such fields are allowed to alternately dry out. The position of the actuator for each of the valves provides a simple visual indication of the state of the valve at any given time.

Abstract: An electronic thermometer is described that is useful for obtaining oral or rectal body temperatures. The thermometer includes a casing on which is mounted a scale for visually indicating temperature readings. A plug-in connector is used to connect an electrical cord to the casing. Such cord terminates in a disposable semiconductor junction through which a constant current is made to flow so that the voltage developed across it is dependent upon its temperature in a straight line function.

Abstract: A theft communication system is particularly useful for indicating the unauthorized disconnection of a television set or the like from any one of the rooms of a hotel or motel. The communication system includes a central transmitter connected with a master television antenna system for transmitting successive querying scan pulses to sensors located on the antenna line at the location of each television set. Each of the sensors is adapted to apply a reply signal to the antenna line if its sensing circuitry indicates that its associated television set has been disconnected therefrom. The time of reply of each of the sensors is different from that of any other, and the system further includes a receiver connected to the antenna line at a central location for receipt of such reply signals.

Abstract: A depth perception television system is described. Light radiation from a three-dimensional scene is collected by a convergent lens and transmitted through a lenticulated grid onto the face of a light radiation sensing tube of a television camera. The lenticulated grid is made up of a multiplicity of vertically oriented lens elements, each of which has a generally cylindrical arc incident surface and a generally planar exit surface. Such lenticulated grid acts to separate light radiation received thereby into a plurality of image elements of each aspect of the scene and then focus the same at predetermined locations on the pick-up surface of the camera. An electrical signal representative of the locations on the face of the camera at which such image elements are focused is formed in a conventional manner by the camera and transmitted to a monitor which conventionally displays such image elements on a display screen, such as the face of a cathode ray tube.