A film thermoelement wherein each branch thereof comprises a film of a semiconductor material contacting on one of its sides a hot thermal bus and on the other of its sides a cold thermal bus. The contact between the thermal buses and the film is maintained through separate strips of a heat-conducting material displaced with respect to each other on the opposite sides of the film. The gaps between the contact strips may be filled with an inert gas.

Sheet material useful in the preparation of draftsmen's and engineers' plans and drawings comprises a base support, preferably of a stable polyester film, bearing a translucent pencil- and ink-receptive coating comprising finely-divided silica pigment dispersed throughout a binder matrix which is essentially a cross-polymerized reaction product of a mixture of a relatively low molecular weight acrylic or methacrylic ester vinyl monomer, a drying oil acrylate, and a blend of polyene and polythiol...

An arrangement for projecting film pictures in which a system of lenses are provided on the side of a window facing the light source. A first mirror in the light beam projected by the lens system, forms an angle with the axis of the light beam. The first mirror is rotated about the axis of the light beam, and a second mirror is located in the light beam deflected by the first mirror, at a first rotated position of the first mirror. The plane of the second mirror forms an angle of substantially 4...

A duplicator for making copies of a microfiche master. The master is positioned at a transfer station and a copy film is stored on a supply roll and incrementally advanced to the transfer station by a film drive disposed upstream of the transfer station so that fresh copy film is pushed downstream into registration with the master. Pressurized air supply conduits are disposed between the film drive and the transfer station and are activated so that the copy film moves downstream on an air cushio...

A film viewer wherein a housing is provided with a viewing window, a film holder is removably positionable in the housing spaced from the window, and illuminating means provided in the housing for passing light through the film holder to the window.

Metallized plastic films having deposited metal layers on both surfaces and being adapted for use as dielectric films, piezoelectric films or pyroelectric films are disclosed. At least a portion of the metal layer deposited on one surface of the film has a relatively increased thickness of 700 A or more and at least a portion of the metal layer deposited on the other surface has a relatively reduced thickness of 600 A or less. The increased thickness and reduced thickness portions are positioned...

Method and apparatus for transporting lengths of film in a camera, particularly for taking pictures from a fluorescent screen, such as an X-ray screen. Using a single motor, the rate of transport is made independent of the rate of exposure, thereby allowing for maximum exposure times, permitting low radiation intensities.

A film editor comprising two parallel plates supporting spindle bearings mounting at least some of the drive components between the plates and at least some of the film handling components external to the plates.

A film cassette has a casing, and a take-up core is mounted in the casing for rotation in opposite directions. An arresting element is connected to the core for joint rotation therewith and is biased toward a position in which it moves in a path during such rotation. A plurality of detent members is provided on the casing so as to extend into said path when the core is assembled with the casing, and each of them has a detent surface against which the arresting element abuts when it is attempted ...

A wrapping film having a high wrapping workability and an excellent anti-hazing property comprises a composition comprising 100 parts by weight of polyethylene, a copolymer of 25% by weight or less of vinyl acetate with 75% by weight or more of ethylene or a mixture of two or more of the above-mentioned polymeric substances, 0.5 to 6 parts by weight of sorbitan monooleate and 0.5 to 6 parts by weight of a liquid paraffin having a dynamic viscosity of 30 to 80 centi-stokes at a temperature of 38....