Abstract: A ball and funnel type yarn tension control apparatus for tensioning a running length of yarn such as textile yarn or the like, wherein a plurality of tensioning devices form a controlled channel and are controlled by an electronic control circuit having a manually adjustable tension setting potentiometer for adjusting a circuit to provide output voltages to the tension devices of the channel adding selecting tension values to the yarn. The tension control devices each comprise an electromagnet coil structure and associated core structure including pole pieces adjacent one or a pair of ball and funnel tensioning stations in each tension device to exert magnetic attractive forces on the ball member and vary tensioning of the yarn leaving the yarn tension device. Degaussing circuit means are also disclosed for applying intermittent negative going pulses to the electromagnet coils during downward adjustment of the tension setting potentiometer to minimize residual magnetic effects.

Abstract: Automatic loom stopping apparatus for use with a loom for detecting warp yarn breakage or improper shedding and actuate the loom stop motion means of the loom, comprising light beam emitter and detector means positioned adjacent the warp yarn path toward the supply end from the weaving zone of the loom forming a monitor light beam transversely spanning the open shed, the detector means providing a detector defect signal when any portion of a warp yarn or broken end interrupts the monitor light beam, amplifier and comparator circuitry for producing a processed defect signal responsive to the detector defect signal, timing pulse forming circuitry including a sensor monitoring rotation of the loom drive shaft for producing timing pulses indicating a predetermined phase time in the cycle of operation of the loom applied to a gate control pulse generator to produce short duration window pulses when the shed is in predetermined open condition, and first and second gate circuits conditioned by the window pulses and

Abstract: An automobile burglar alarm including a battery voltage level sensor to be connected to the positive terminal of the automobile battery for providing an output signal level indicating the battery voltage level and responsive to reduction in the automobile battery voltage when an automobile dome light or trunk light supplied by the battery is turned on to provide a changed output signal level which persists for a predetermined time period, indicative of the reduced battery voltage level, a normally non-conducting transistor connected in circuit with the automobile headlight and horn relays to a supply voltage source to energize the relays when the transistor conducts, a timer circuit connected to the transistor to supply a timed output signal for causing the transistor to conduct for a predetermined short conduction interval, and an operational amplifier coupled to the sensor and the timer circuit for supplying an amplified signal adequate to cause the timer circuit to produce the timed output signal.

Abstract: A unit type strain gauge having a protective outer casing of a hard material provided with an internal space open at one side and a pressing member housed in the internal space arranged to press a strain gauge element attached to it against an object, in which strain is to be measured, the remainder of said space being filled with soft synthetic rubber arranged to maintain the parts of the gauge in position and to maintain a dust proof and moisture proof structure.