An extended range sonar in which a projected carrier sound frequency is modulated by second and third lower sound frequencies and a train of alternate pulses of the second and third frequency modulated carrier frequency are projected at a fourth frequency switching rate. The echo signal is extracted from the total received signal by first abstracting the second and third frequency components of the envelope of the received signal; abstracting the fourth frequency component of the envelope of eac...

Concentrators for metallic ores, particularly precious metal ores, using centrifuging cyclonic air action without water for primary separation of the heavy metal particles and ore from dust, dirt and lighter particulate. The relatively coarse ores and particulate are collected by gravity drop at the bottom of a centrifuge, while the fines and dust are withdrawn from adjacent the top thereof and fed through a further separating apparatus which blows out the dust and then passes the remaining part...

Convertible backpack and cot apparatus including a breakdown, rectangularly shaped, tubular cot frame including first and second pairs of frame elbow members forming the corners thereof and first and second pairs of tee devices connectable with the ends of the side runs of such elbow members. Side members connect on their opposite ends with the tee devices and crossmembers connect on their opposite ends with the confronting end runs of the elbow members. First and second U-shaped leg means are p...

A thermocouple for attachment to a burner. The thermocouple has a mounting portion and an adapter thereon engageable with the burner. The adapter and the mounting portion are yieldably restrained against relative sliding movement to facilitate adjustment of the thermocouple relative to the burner flame.

A dry feed dispenser for fish comprises a container the lower end of which is blocked by a skittle-shaped member from which a pendulum extends downwards into the water. Displacement of the pendulum and hence of the skittle-shaped member by a fish causes a dose of granulated feed to be released from the container and fall into the water.

A thermostat set for selective connection with a center tap transformer and a temperature control device operator and to be selectively assembled to provide a thermostat with or without a control switch. The thermostat set includes a base including first through fourth electrical terminals and having a bridge circuit thereon which includes first and second resistance means formed with a node at their common end. The first resistance means is in the form of a temperature sensor. The base circuit ...

A photographic printing apparatus for printing a series of patterns of prints and including a film carrier for positioning film to have light projected through the frames thereof and along an optical axis for projecting images on printing paper positioned on a printing paper support. First and second lens sets are provided for selective movement into the optical axis for projecting respective first and second patterns of images onto the printing paper, such patterns occupying respective first an...

An apparatus for dispensing a metered quantity of fluid, in which the fluid is stored under pressure in a container that is normally open to a metering chamber, but which, when the apparatus is actuated, has valve means closing the connection between the storage container and the measuring chamber, and the measurin chamber is then connected to a discharge outlet for the positive ejection of the fluid.

A motor control device for controlling the speed of an electric motor and including electrical resistor means formed with a plurality of portions disposed in heat exchange relationship with one another and flexible toward and away from one another to adjust the heat exchange rate therebetween, the electrical resistance of the portions being temperature responsive whereby current therethrough is responsive to the temperature thereof. Adjustment means is provided for moving the portions toward and...

An electronic apparatus and code conversion method for use in a data terminal system incorporating a modified type head electric typewriter as the data input-output device. A single timing sequence automatically controls all code converting operations of the terminal for both transmitting and receiving data. In a transmit cycle of the timing sequence, a keyboard code of the typewriter is converted to a selected one of a number of communications line codes which is then transmitted over the line....