Abstract: A gas-filled discharge tube in which a cylindrical protection terminal is fitted to a gas-charging pipe passed through an electrode, and the electrode, the gas-charging pipe and the protection terminal are connected by electrical conductive binder filled in a clearance of these elements. A high-tension cable device in which at least one of a connector terminal or a power supplying terminal is formed with a concave part fitted, contacted with a connection part of an additional function parts such as a series-gap forming discharge tube. A high-tension cable device has a concave part covering an entire connection part of the additional function part and has a threaded part at an inner surface. An outer surface of the connection part of the function part corresponding to the concave part is formed with a threaded part.

Abstract: A light weight and compact geophone assembly for detecting transient seismic signals along orthogonal axes. The geophone assembly having a plurality of geophones arranged within close proximity of each other within a compact housing. The geophones are interconnected to a conductor cable passing through the housing in a unique water-tight sealing arrangement. At the cable entrance into the housing, the conductor cable is surrounded by a tapered boot compressed about the cable by a sleeve which in turn is fixed in place by a locking nut. The locking nut is received by complementary threads at the cable entrance into the housing. When tightened, the locking nut forces the compression sleeve over the tapered surface of the boot, compressing the boot about the cable. In addition, the locking nut and compression sleeve urge the boot in compression between the cable and the housing. Located atop of the housing is a bubble leveling device.

Abstract: An ignition coil for spark ignited internal combustion engines intended for mounting on and connection to a spark plug which simplifies high voltage distribution, promotes maintenance and safety, lessens radio interference, and reduces exhaust emissions. The ignition coil preferably has a tight fitting resilient insulating boot engaging the spark plug. The boot member preferably has an air passage with a contaminate filter for facilitating the insertion of the boot on the spark plug. One embodiment includes a grounding member connected to the ground lead of the primary winding of the ignition coil which engages either the grounded portion of the spark plug or the cylinder head for grounding the primary winding of ignition coil.

Abstract: A braided metal sheath 11 is anchored on an ignition wire 10 to protectively encase wire 10 and leave the sheath ends 14 spaced at an electrically insulating distance from terminal end regions 9 of wire 10 to prevent shorting out the ignition wire. The anchorage can be made by sliding a shorter length of a separate sheath onto a longer length of ignition wire 10, winding a wrapper 13 over each of the sheath ends 14, and then clamping with a radially compressible clamp that fits over and conceals wrapper 13. The sheathing can also be braided directly onto a continuous length of ignition wire 10 that is cut to individual wire lengths. Then end regions of the sheathing are cut and stripped from the ignition wire to leave sheath ends 14 at an electrically insulating distance from terminal ends 9 of wire 10. Sheath ends 14 are then clamped to wire 10 to conceal the sheath ends and prevent fraying.