Sunglasses having a pair of removable lenses. Each lens has side-by-side zones of different light-transmitting characteristics. The frame is arranged with lens-supporting means adapted to selectively support the lenses in one of two relatively inverted positions with either of the zones directly in front of the wearer's eyes and the other of the zones at the side adjacent the temple of the frame.

A first and a second magnet comprise the magnetic engine. The first magnet is coupled to the free end of a pendulum and the second magnet is pivotally mounted, and responsive to the swinging of the first magnet to cause pivotal or rotary motion of the second magnet.

A system for quick freezing of articles in which an elongated, vertically oriented housing is provided with elevator means for successively and incrementally lowering trays containing the articles through a freezing chimney within the housing. A cryogenic coolant is introduced through metered orifices along vertical pipes extending upwardly through the chimney. The internal chimney surfaces are arranged to cooperate with the trays and coolant orifices so that the articles in the trays are subjec...

In a materials handling vehicle with lift arms, a cradle is pivotally mounted on the lift arms and a material handling bucket is pivotally mounted on the cradle. The bucket can be locked to the cradle to enable normal tipping of the bucket on the lift arms by the tipping ram, or the cradle can be locked to the lift arms to enable tipping of the bucket on the cradle to enable the tipping height to be increased without increasing the overall height of the vehicle. There may be an acceleration link...

A sensor for an electrical hygrometer of the capacitance type comprises two metal wire electrodes one at least of which has a hygroscopic layer and the two wires are brought into intimate contact with one another to act as electrodes by twisting, wrapping or winding them together but electrically insulated from one another. The two wires may be of similar gauge and twisted to double helix form, or laid side by side and bound together, or a fine gauge one may be wound helically round a straight c...

A total image storage and retrieval system has a copier, step and repeat camera for photographing documents on microfilm frames, and means for developing the microfilm and assembling the frames on microfiche cards that are encoded and stored in a large capacity storage bin having associated means for automatically retrieving the microfiche. One or more retrieval stations, each typically having a keyboard for selecting images sought to be retrieved and a display, such as a television tube, for di...

An eye measuring instrument employing a modulated invisible light source which illuminates the eye and a pair of photocells directed to the interface of portions of the eye with different light reflecting properties. The interfaces selected move in response to eye movement or pupil area change, and the changes in the photocell outputs are a measure of the eye movement or pupil area change.

A means and method for cleaning elongated axially extending information-carrying tape is provided. The tape is passed over a plurality of slots positioned transversely to the longitudinal axis of the tape with each of the slots defining a cleaning edge and having a vacuum chamber thereunder. A pulsating vacuum is applied to the vacuum chamber to cause portions of the tape to be moved toward the vacuum chamber during passage over the slots with all portions of the tape being cleaned by vacuum act...

A baby's pacifier exercise or teething device including a tube of resilient flexible material. The tube may be formed in a ring having one or more intertwined loops. The tube also may be filled with a material, such as bunched or crumpled sheet plastic, which generates an audible crinkling sound as the tube is deformed.

A hydrodynamic torque converter or converter-coupling, either on its own or as part of a motor vehicle automatic transmission, wherein the impeller blades are adjustable over a range, so as to provide over said range, variation in the effective diameter of the impeller.