Abstract: Pools and spas formed with lamp house accommodating wall conformations below normal water level are fitted with a flexible tubing lamp house containing special lamps having a safety conductor ending unconnected in the interior of the lamp envelope. The lamp energizing circuits and a grounding circuit connected to the safety conductors of the lamps are disposed in the lamp house with a water insoluable, light transmitting electrical insulating material which serves to insulate the circuits and exclude water.

Abstract: A method and apparatus are disclosed in which body fluid chemistry is measured in either differential or nondifferential mode using apparatus of the kind employed in infusing fluids into patients' blood streams, either with or without combination with such infusion, to the end that measurement of body fluid chemistry is conveniently and measured automatically at selected frequency.

Abstract: A cigarette or cigar holder and filter, or a pipe insert, capable of removing tar and nicotine products from tobacco smoke combines a sloping, preferably conical condensate flow control target and trap with air cooling to permit smaller construction than previously available, at a cost that makes disposability practical.

Abstract: An improved arrangement for driving threaded screw fasteners both manually and automatically utilizes mating conformations in the fastener head and driver including a central, preferably conical, depression in the head and a complementally shaped central projection extending from the driving tool. Further, the head is formed with slots, less deep than the depression, which open both at the depression and at the outer margins of the head. The driver is formed with corresponding blade sections.The central projection and depression are formed such that force along axis of the driver toward the head and rotational force about the driver axis tend to force the fastener axis to alignment with the driver axis.

Abstract: A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis, in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.

Abstract: An improved automatic steering controller for boats employs an adjustable feedback link between the output element and feedback elements of the system. A preferred form employs a lever arrangement in which the feedback ratio is varied by varying the lever arm to connections from the lever to one or the other, or both, of the output element and feedback element. The lever is related to the feedback element in a way that facilitates reversal of feedback element movement whereby to permit steering control from either side, port or starboard, of a tiller or wheel.

Abstract: A tube holder includes a clamp formed by a clamp base and a wrap-around strap. The strap is fixed at one end to the base and, after wrapping around the tube, is locked to the clamp base at a point along its length in a double locking system.

Abstract: An improved peristaltic pump employs a pump tube which is pre-stressed by being twisted in the direction of the length of the tube about its axis.

Abstract: A backpack is disclosed which is provided with shoulder straps and a back rest. The shoulder straps and back are independent of the pack container whereby to permit distribution of the weight to be carried and to facilitate the carrying of heavy loads. The frame is formed of a series of sub-frames which unfold to form a structure which can serve as a chair and as a stand for holding and retaining the pack container in upright position when the pack is not being carried.

Abstract: A security device incorporates apparatus for producing a special alarm sound in response to a change in acceleration sensed with a special omnidirectional sensor and under the control of special SCR circuitry. The circuitry and sensor are especially adapted for the security application but have independent utility.

Abstract: The deviation in operating frequency which antenna system elements can handle without serious transmission line mismatch is increased by constructing the antenna such that the inner portions (40, 42) of its legs (40,48 and 42,50) are formed of coaxial transmission line connected so that the outer conductor serves as part of the radiator, and so that the inner and outer conductor of the line cooperate to form compensation stubs whose impedance varies with frequency in a manner to cancel or oppose the reactance which the antenna legs exhibit with frequency change. The stubs are connected in series or in parallel with the antenna feed point and parasitic elements. Surge impedance is selected so that the antenna driven elements (nearly resistive) and signal source, and parasitic elements that incorporate the invention, are mismatched at band end frequencies and center band frequency in apparoximately like amount.