A foot switch operated by a driver of a vehicle such as a taxicab actuates a circuit which disables the indicating lamps in the taxi's roof light and energizes distress signaling lamps in the roof light so that it flashes on and off. The flashing roof light calls attention to the cab and informs others that the taxi is in a distress situation.

The invention provides a cryostat whose components are detachably connected to each other. Each of the tanks (1, 7) is equipped with only one radial pipe (15 or 16) arranged at the end of the tank (1, 7). Each of the inner components (3, 7) is provided, at its end neighboring the pipe (15), with a detachable cover (5, 9), and provided with a recess (31, 71) into which the pipe (15) can be introduced from the end of the component. The jacket (11) is divided in a plane neighboring the pipes (15, 1...

Disclosed is the reaction of propane and isobutane with O.sub.2 and NH.sub.3 to make .alpha.,.beta.-unsaturated nitriles and olefins, using certain complex metal oxide catalyst compositions and an excess of the paraffin over both the O.sub.2 and the NH.sub.3. Also disclosed are suitable catalyst compositions for such reactions.

A multifunction spotlight and control system therefor, the spotlight functions each being adjustable by a bipolar stepper motor, a control means such as a dimmer unit for enabling analogue control of the rotational positions of the motors, and a second control means such as a microprocessor which enables a multichannel serial datastream to be supplied for selectively controlling the motors.

A cutting blade and a cutting blade holder are described which, when used together provide exceptional stability to the cutting blade. The cutting blade/blade holder assembly is particularly adapted for use in combination with a carpet cutting device for cutting matched seams in wall-to-wall carpet laying installations.

A disc cartridge and a casing therefore capable of carrying out insertion and removal of a disc with respect to the casing without separating a shutter from the disc cartridge and adversely affecting the disc, with simple operation. The casing includes a casing body constituted by an upper cover member and a lower cover member joined together to form an inner space therein which is adapted to rotatably receive therein a disc having a non-recording section formed at its outer periphery and be sep...

A slate and the method of manufacturing therefor comprising substantially a single color mortar cement. The outer surface of the slate has at least two different shapes which produce a different color variation to one another.

A missile with upstanding hook members for engaging a slideway forming part of a launch station for the missile, e.g. beneath an aircraft, is fitted with a sub-frame incorporating ram and cutter knife assemblies for severing the hook members from the missile as it is launched leaving the missile with a better aerodynamic shape.

A slide gate has a frame assembly with a pair of side guides, a bottom member and a top member that define an opening through which fluid flows. A movable slide plate is mounted to the frame assembly and constrained for movement between unblocking and blocking positions for regulating fluid flow through the opening. A side seal, which is seated within each side guide of the frame assembly, has a lip seal portion and bulbous portion, the side margins of the slide plate being received in sealing e...

A mattress is positioned on a flexible deck which is supported by tension members connected to a frame. In a preferred embodiment, the frame is formed of concave side rails, a horizontal head rail, and a horizontal foot rail. The upper surface of the deck is longitudinally concave and transversely convex. The mattress is tapered so that its upper surface is transversely and longitudinally crowned to counteract any potential sagging effect when a person lies on the mattress.