A hammer for a hammer mill, cast from austenitic manganese steel, is cast with a pad of extra metal surrounding the eye, the extra metal being work hardened to inhibit stretching of the eye when the hammer is revolved with its supporting rod which fits the eye diameter.

A system for recording and randomly selecting and reproducing audio-video information signals is provided with means for encoding audio and frame code information signals within video information signals.

An improved electrical switch, in which the switch element is removable from the switch housing and replaceable by a similar switch element, with the external electrical conductors being permanently connected to the said switch housing. The switch element, including the operator, may be fastened to the switch housing by means of an external screw thread on the switch element body, which mates with the female thread form in the recess in the switch body, to make electrical contact with the extern...

A digital to analog converter is supplied with operating current from a reference current source including an operational amplifier, across the input terminals of which are connected a reference voltage and a reference resistor in series. The output of the operational amplifier is fed back to the input by a reference transistor coupled between one of the input terminals and a source of potential. The current flowing through the reference transistor is established by the reference voltage and the...

An Anger-type scintillation camera employing a threshold preamplifier at the output of each photomultiplier tube to eliminate the contribution of tubes distant from the location of each scintillation to the coordinate position signal, thereby improving the intrinsic resolution of the Anger-type detector.

A contactor comprises improved contact means. The stationary contact structure comprises a conducting support with a contact and arc-runner supported thereon such that the arcs leaving the stationary contact move directly onto the arc-runner. The stationary contact structure is constructed to facilitate removable mounting thereof on a conductor. A metallic shield member is provided to protect the insulating material of the insulating contact carrier from the heat and impact of the bridging conta...

A clamping circuit for use in a color television receiver. The DC voltage level of color signal transmission paths is reestablished during horizontal retrace periods by applying a clamping pulse derived from the horizontal output transformer directly to the transmission path. The maximum excursion of the voltage thus applied is limited by a diode reverse-biased by means of a reference voltage network, which includes a transistor resistively coupled between a voltage source and ground. The transi...

An improved AVC circuit for an alternating voltage amplifier which prevents over-control, and thus temporary blocking of the amplifier circuit, upon the occurrence of a sudden large increase in the amplitude of the input signal to the amplifier. The control voltage generating arrangement of the AVC circuit is constructed so that the time constant of the control voltage is increased proportionately to the increase of the output voltage from the amplifier when ever the output voltage exceeds a pre...

An improved soldering alloy for soldered joints comprising one or more aluminum members has a base containing lead and bismuth to which is added a small amount of silver or indium. The solder alloy has a low melting point of typically less than 480.degree.F together with very good corrosion resistance. The alloy can also contain relatively small amounts of tin, zinc and antimony.

A wide-angle color television picture bulb comprising a generally rectangular glass faceplate having horizontal and vertical axes, said horizontal axis being longer than the vertical axis, a substantially wide-angle hollow glass funnel having a generally tubular neck at one end, a generally tubular flaring yoke area extending from the said neck, and side walls joined to and diverging from said yoke area to a portion joined to said faceplate. The funnel side walls which extend generally parallel ...