A liquid level detecting device for vapour generators is characterized by a stack tube for connection to the vapour generator and preferably two separate side tubes in the form of loops each having an upper vapour inlet to the stack tube and a lower outlet disposed respectively at a low water level and a high water level. In use the loops fill with cooled condensate. When the water level moves past either of the cooling tube outlets the condition of that tube is disturbed, and the cooled water i...

In a deceleration detecting device, magnetic induction electromotive force is utilized as a signal for expanding an air bag, and magnitude of this magnetic induction electromotive force is proportional to a speed variation ratio of a movable magnetic substance transferred by deceleration exceeding a predetermined value of a vehicle in order to decrease a detecting time.

Gas detecting sensor made of SnO.sub.2 characterized by containing less than 5% by weight of at least one of Al.sub.2 O.sub.3, ZnO, SrO and BaO and less than 1% by weight of chlorine. The gas detecting sensor has a high sensitivity selectively to carbon monoxide but has a low sensitivity to hydrocarbon gases.

A signal detector for detecting weak signals in a noisy background which treats the incoming signal and samples it to produce outputs corresponding to amplitude during each sampling period. The sampled output is then accumulated for each period and an output signal of one amplitude is produced when the accumulating means is above a predetermined level and a second amplitude when the accumulating means is below said predetermined level.

An apparatus for detecting movement of a member having perforate and imperforate portions. The apparatus includes spaced fluid jet devices each provided with a fluid input and a fluid output which is spaced from the input. Each jet device is aligned with the perforate and imperforate portions of the member and the devices are so positioned that, when the member is stationary, fluid flow across at least one of the jet devices is interrupted, which condition is sensed by a drop in fluid pressure a...

A gauge designed to detect and give visual indication of the presence of free water at a predetermined depth in the ground. The gauge has a tubular housing in which is confined a spherical float with an attached float stem. The housing is a rigid tube enclosed at top and bottom by friction fitting caps, the bottom cap being distinguished by an upstanding flange which fits the tube tightly at its lower end and then diverges from the tube wall to form a gutter at the base of that wall. The spheric...

A valve for detecting pressure differences between two spaces one of which may be atmospheric air and which valve includes a wall opening between said spaces whereby upon an increase in pressure on the media in one space said valve will open and allow the discharge of said media through said wall opening, but when the pressure in said spaces is equal or the atmospheric pressure is greater than said wall opening is closed.

This invention relates to a device for detecting the rotation speed of a vehicle, especially to a device which can be connected between a transmission and a speed-meter. For this purpose, a bearing case is rotatably mounted on a rotary shaft which is connected to the transmission at one end and to the speed-meter at the other end by means of a flexible cable.

A receiver for multifrequency call signals is disclosed which discriminates against the detection of any except a predetermined plurality of tone signals occurring in specified frequency bands. The detection is accomplished by a plurality of reasonator-amplifiers tuned to the specified frequencies each of which has a threshold controllable device at its output. The signals received by a group of the resonator-amplifiers are summed and the resultant signal, amplified to a predetermined amount, is...

A method for detecting defects in textile yarns comprising the steps of withdrawing yarns from packages, winding each yarn a plurality of wraps around a support surface with the wraps of each yarn being displaced from the wraps of adjacent yarns, applying a composition comprising a colorant and a solvent mixture to the yarn wraps on the support surface, permitting the composition to undergo phase separation, and comparing the resulting depths of shade of the respective yarn wraps. Also, apparatu...