Abstract: A process and an apparatus for cooling and handling sand in which hot used sand is delivered to a mixer and mixed with cooler sand. The mixed sand is discharged from the mixer for circulation on conveyor means for further cooling and the cooled sand is separated into a first fraction for discharge to successive milling and moulding stages and a second fraction for return to the mixer to effect sand mixing with the hot used sand. Water may be added to the mixed sand in the mixer to adjust the moisture content and to increase cooling.

Abstract: A lamp comprising a wick-holder moulded in one piece from poly-4-methylpent-1-ene or like plastics material which is naturally buoyant upon combustible oil and which includes a central wick-retaining recess, a peripheral portion disposed above the recess, and at least one arm linking said recess to said peripheral portion and disposed below the peripheral portion. In use the lamp holder floats in oil with the central wick-retaining recess and the or each arm submerged and with only the peripheral portion floating.

Abstract: A ratchet type quick feeding mechanism for an automobile pantograph jack including a round bar having a ratchet screw portion, a pawl member for engaging the teeth of the ratchet screw portion, a connecting block carrying a horizontal shaft on which the pawl member is pivotally supported, and pantograph link assemblies for changing the height of the jack by horizontal shift of the connecting block.

Abstract: A portable survey system housed in a suitcase-like assembly, the cover of which supports an electronic display panel having a number of individually energizable display elements. A number of responder units, each connected with the display assembly to control the selective energization of a group of display elements, enables various individuals to cast votes which are preserved in total anonymity by the "pseudo-random" energization of the display and the use of a master control switch to prevent any display from being provided until after all votes are cast. The base of the case contains a plurality of separate compartments for receiving the individual responders for storage whereby the entire unit is self-contained and may be easily transported and subsequently set up for use in businesses, schools, hospitals, or merely for entertainment purposes.

Abstract: Electronic display apparatus simulating a mechanical analog display for the portrayal of two or more measured variables includes an indicator assembly having a substrate supporting a plurality of optically variable elements, combinations of which enable the visual presentation of the measured parameters relative to a fixed scale or to each other. The apparatus is especially well suited for use as the time display of an electronic horological instrument either alone or together with a month and date digital display and/or a day of the week display which includes an array of seven indicators five of which are arranged to form a separately discernable group representing the days Monday, Tuesday, Wednesday, Thursday and Friday. The display apparatus is electronically driven and includes no moving parts.

Abstract: Apparatus for preventing overvoltage and overcurrent damage to direct current motors, and wheel lockout in electrically powered vehicles having dynamic and mechanical brake assemblies includes dynamic braking voltage and current sensing circuits, a first network responsive to detected dynamic braking voltages exceeding a predetermined value, a second network responsive to dynamic braking currents exceeding a predetermined level, and a third network responsive to dynamic braking current exceeding a different predetermined level at the same time that excessive mechanical braking occurs and for providing an output when such conditions coexist for more than a predetermined time period, and an interrupting circuit responsive to outputs from the first, second, and third networks for interrupting dynamic braking and substituting therefor mechanical braking.

Abstract: A method for cleaning the fixed spring-contacts of a cylindrical, drum-type television tuner or other electrical switch having contact-carrying strips arranged around the circumference of a rotatable drum, in which a cleaning implement is attached to the drum and is rotated into engagement with the fixed contacts so as to clean the same. The implement includes a support for attachment to the drum and a cleaning element on the support for engaging and cleaning the spring-contacts of the switch upon rotation of the drum. The cleaning element may be a set of eraser pads, an elongated eraser strip, or a coating or layer of abrasive material; and the support element may be made for the attachment to the drum either in superposition with an operative contact-carrying strip or in lieu thereof.

Abstract: A dirigible vehicle which is supported upon at least three ground engaging wheels located about the lower periphery of the device. Two of the three wheels are steerable while the third is fixed in position with its axis perpendicular to a line interconnecting the two steerable wheels. By manipulation of the steerable wheels, the vehicle may be adapted for movement along a linear path or may be made to spin about its own axis. Intermediate positioning of the steerable wheels will cause the vehicle to sweep in large circular arcs. The device may be self-propelled by a foot pedal assembly or by a small motor, with either a single steering wheel or dual independent steering controls. The unique steering capabilities of the vehicle make it ideally suited for recreational purposes or wherever extreme maneuverability is required.