Abstract: A fish attraction device having a case and wing and wing support members. The wing automatically assumes a diving angle when trolling and an upward angle when a fish is hooked. The case may be provided with a flashing light circuit which has a phosphorescent coated light bulb.

Abstract: A switch having gold-plated contacts on which is formed a gold-mercury amalgam, at least the contacts being immersed in a totally fluorinated hydrocarbon fluid.

Abstract: A meter for measuring the relative velocity of an object, including a diplexer for illuminating the object with a beam of microwave energy and for developing from energy reflected from the object a difference signal having a frequency which is proportional to the relative velocity of the object, a phase-locked loop for synchronizing the frequency of an internal oscillator with that of the difference signal and for developing a lock signal when synchronization is achieved, a lock detector and timer and a timer for developing a reset signal from the lock signal, a predetermined period after synchronization is achieved and for developing a latch signal a predetermined period thereafter, a circuit for counting the cycles of the internal oscillator which are developed after the occurrence of the reset signal until the occurrence of the latch signal to develop a sum signal indicative of the relative velocity of the object, and a circuit for displaying the sum signal.

Abstract: Microwave apparatus for detecting the movement of a moving object comprising a Gunn oscillator device having input terminals that are capable of receiving a potential difference which serves to produce a bias current in the device, said potential difference being subject to variations, the device being responsive to a constant potential difference and operative to radiate microwave energy at a first frequency, and further responding to Doppler shifted energy reflected from the moving object and producing a variation in the bias current, an operational amplifier responsive to the potential difference and a reference signal for developing a first signal when the potential difference exceeds the reference signal and a second signal when it is less, a series-pass transistor connected to a source of DC potential and the operational amplifier and being switchable between a conducting and a non-conducting state in response to the first and second signals and serving to maintain the potential difference at a constant

Abstract: An apparatus for automatically controlling the operation of a door comprises a microwave transceiver responsive to detect the movement of a randomly moving object and operative to develop a Doppler signal representative of such movement, the Doppler signal being generally sinusoidal with a zero crossing in each cycle, a strobe generator responsive to the Doppler signal and operative to develop a timing pulse upon the occurrence of each such zero crossing, a pair of integrating circuits responsive to the Doppler signal and operative to develop first and second signals of unlike polarity in the absence of the movement and of like polarity in the presence of the movement, a pair of OR gates for detecting the respective polarities of the first and second signals, a sample and hold circuit responsive to the timing pulse and operative to develop a control signal when the first and the second signals are of like polarity, and a relay driver responsive to the control signal and operative to open the door.