Abstract: An air compressor having a main pressure line connected to an object to be inflated and an accumulator connected to the main pressure line through a restrictor to receive an average of the output pressure during the pumping stroke and to receive, at other times, the actual object pressure so that the pressure in the accumulator corresponds to the pressure in the object, and a relief valve responsive to the pressure in the accumulator for connecting the accumulation to atmosphere when a pressure preselected by a regulator is obtained in the object.

Abstract: The container comprises an open-topped cylindrical container body having a pair of tabs on the upper end of the outside, and a removable cylindrical resilient cap, having a sidewall with vertical grooves on the inside matching the tabs in location, but closer together diametrically than are the tabs. The cap is deformable to accommodate the tabs. The sidewall also has a pair of about horizontal arcuate grooves extending from the vertical grooves larger diametrically than the vertical grooves to receive the tabs. The horizontal grooves may narrow as they diverge from the vertical grooves. The cap cannot be removed from the container body without first rotating the cap to free the wedged tabs, then ovaling the cap to allow the cap to be rotated to a position where the vertical grooves and tabs are aligned, whereupon the cap can be lifted off the container body.

Abstract: The herein disclosed test instrument includes an arrangement for measuring the standing wave ratio of a transmitter, antenna combination which comprises a printed circuit board having a first conductive path thereon adapted for connection in series with the energy flowing between a transmitter and its associated antenna, a second conductive path contiguously disposed on the printed circuit board such that energy is electro-magnetically coupled from the first to the second conductive paths; circuit means for sequentially measuring the energy flowing in opposite directions along the second conductive path; and meter means for displaying the ratio of the measured energy. The test instrument further includes a circuit for measuring the transmitter's output power wherein the "loading" of the metering circuit on the transmitter is substantially reduced.

Abstract: A recording compression testing meter having a measuring cylinder connected to the spark-plug hole of an engine cylinder by means of a tube and having an indicator arm movable by the piston of the measuring cylinder over a portion of recording paper fed from a roll of paper carried in a removable cartridge, the paper being fed from the roll by a drive mechanism carried by the cartridge so that tests of a large number of cylinders can be recorded on the continuous sheet of recording paper fed from the paper roll before it is necessary to reload the meter and the test of the cylinders of each engine can be torn off and stored separately.

Abstract: A casing construction is provided which can be utilized for the assembly of components of either a combination vacuum/pressure gauge or of a high pressure gauge while utilizing the same dial indicator movement; the combination vacuum/pressure gauge having a vacuum connection at one end of the casing and a pressure connection at the other end and the same complete scale can be utilized for the measurement of either value.

Abstract: One embodiment of the herein disclosed switching arrangement comprises a printed circuit board having two parallel slots formed therein with a plurality of contact points disposed between the slots; and a housing mounted so as to allow its movement along the slots and including at least one electrically conductive member mounted within a cavity in the housing such that for different positions of the housing along the slots in the printed circuit board different ones of said contact points are shorted together.

Abstract: A moisture meter construction in which a conventional meter assembly is mounted within a housing, an access opening into said housing, a tubular member integrally secured to said housing having an opening therethrough with the opening of the tubular member being aligned with the access opening, an annular chamber surrounding the tubular member, a metallic probe assembly tightly fitted within said annular chamber, a tapered plug member surrounding a portion of the metallic probe assembly being snugly located within said annular chamber, the free end of the probe assembly having an electrical insulator placed within the metallic probe member and a dissimilar metal located interiorly of the insulator with the entire probe assembly being tightly sealed.

Abstract: An electrical meter apparatus wherein the elements of construction of the meter are so constructed as to not warrant any significant amount of precision in manufacture. A selector knob is connected to a switch rotor with a switch rotor being mounted upon a panel bushing which is fixedly connected to the meter housing. A limited amount of canting movement is permitted along with the normal rotative movement between the switch rotor and the panel bushing. The switch rotor is connected in a non-precision manner with a socket and a plug. The plug is loose fittingly connected within an opening in the printed circuit board of the meter. A limited amount of canting movement of the plug is capable of occurring with respect to the printed circuit board.

Abstract: A remote actuated switch capable of carrying relatively large conductive current with the use of small, leaf spring contacts which have upturned ends providing first substantial point contact areas upon initial contact with a contact ring and providing larger contact areas with the contact ring upon bending of the contacts by movement of the plunger carrying the contact ring; the plunger being slidably movable in the housing and spring biased to switch open position.

Abstract: A compression tester having a rotatably mounted dial disc cooperating with a stationary index line and a piston responsive to compression pressure movable against a spring for rotating the dial disc and a support plate for the dial disc providing for confined movement of the dial disc and low friction resistance to movement.

Abstract: A handle for an instrument casing or other device, which handle is rotatably mounted by an extension handle section to the instrument casing so that the handle can be moved from a completely retracted position to a fully extended position, the handle having a detent mechanism consisting of a roller extending across the surface of said handle extension section and supported by a spring wire passing through the roller and supported at position spaced from the end of the roller to cause said roller to roll from one detent depression to another in the extension surface, the bearing supports on the extension section of said handle being hollow to permit leads to pass through the handle into the instrument casing.