A device for determining the topography of an optic including a support member having a measuring unit mounted thereon. The measuring unit includes an optical system having a target assembly operably associated therewith and mounted in optical alignment with the optical axis of the optical system. Means included to maintain the optic in statonary, aligned relation with the optical axis. The target assembly includes a target member adapted to be illuminated by a source of light to produce an illu...

A heating device including a pair of spaced electrodes one of which is hollow and has an outlet for a gas, an intermediate hollow electrode positioned between the principal electrodes, a control circuit including a control switch and a current sensing device connected between one of the principal electrodes and the intermediate electrode such that the current flow sensing device provides an indication of the current flowing between the principal electrodes and the intermediate electrode includin...

An improved pyrotechnic device is provided for use where large quantities of light are required in emergencies. The device comprises a pyrotechnic torch fitted with a parabolic reflector made of fireproof or fire retarded material. The reflector is coupled to the torch so that it can slide longitudinally along the torch to enable the light to focus into a spotlight or floodlight. The entire unit is inexpensive, light, compact and easy to use. It may include a self-match igniter.

Means for use in template-controlled sewing devices in which a magnetic roller rolls along the peripheral edge of the template, for preventing a recoil of the roller out of the internal corner of the template when said roller reaches the corner with a proportional high speed. The means consist of a supporting body which carries the workpiece clamping means and the template and which rests on the support means slidable in a horizontal plane and under the own weight. Furthermore, there are provide...

A directional device for overland travel to aid in returning to intersect a roadway, in which a pair of concentric rotatable dials and a freely rotatable compass needle are mounted on a frame. One dial carries a first reference indicium while the other dial is divided into a pair of individually identifiable semicircular arcs having a reference divider at one junction of the arcs. The dials are releasably fixable one with respect to the other and the one dial is releasably fixable with respect t...

This invention relates to a privacy screen comprising a screen panel having a perimeter edge surface between opposed facia surfaces; perimeter moulding extending longitudinally of said edge surface and having rigid side walls in face-to-face relation; said side walls each having a longitudinally extending seat and a locking shoulder underlying said seat.

A conveyor assembly for the transport of work pieces from one station to another comprising a source hopper and a conveyor trough having a longitudinal recess therealong within which is carried one stretch of an endless chain equipped with work piece-engaging protrusions. A series of deflectors are connected to the trough proximate the chain conveyor so that as the work pieces are transported by the endless chain and work piece-engaging protrusions, the pieces are urged into end-to-end alignment...

An optoelectronic device comprising a photoconductor and an emitter which are electrically interconnected, the photoconductor being made from low-resistance semiconductor material with high-resistance inclusions forming n.sup.+n or p.sup.+p junctions at their boundaries in accordance with the type of conductivity of said semiconductor material, which ensures the generation of infralow-frequency electric oscillations.

A fishing device attached to a leader or flexible strand to which a fishhook or lure is connected, and having a hollow open end into which the hook is drawn when a pull is exerted on one end of said leader or strand by a fish caught on the hook, so that the mouth of the fish is drawn into said hollow end portion and confined to prevent the fish from flipping the hook out of its mouth. A weak spring is connected to the device and to an end of the leader which connects with a fishing line, to hold...

An exerciser device is provided for exercising various parts of the body, particularly the back and legs of a person using the device. The exerciser device comprises a back support on which a person may lie and a ladder member having an end extending over the person. The device may further comprise an upright support for supporting the extending end of the ladder member. The extending end of the ladder member is adjustably connected to the upright support and the other end of the ladder member i...