A camera is provided which is adapted to accommodate rectangular film packets or cartridges of two different sizes. The end wall dimension of each packet is substantially the same and the smaller packet is provided with unique exterior protuberances formed along the elongated sides thereof. The camera includes an opaque housing with a lens mounted on the front end thereof, and a film packet holder affixed to the interior of the housing and spaced rearwardly of the lens. The holder comprises a fr...

In a building block set made up of a plurality of blocks of different sizes, the blocks are provided with plug-and-socket connectors. Those blocks which have a relatively small number of such connectors have the latter designed to provide a relatively tight fit, while those blocks which have a relatively large number of the plug-and-socket connectors have the latter designed to provide a looser fit.

An aircraft arrester system of the type in which a hook mounted on an aircraft engages with a wire connected to braking means, said wire being complemented by additional wires, each of the latter wires having a brake or brakes and each of said wires being arranged parallel and sequentially in the direction of aircraft movement to arrest the movement of aircraft of different weights, such aircraft being provided with additional arrester hooks each of which is intended to engage its respective wir...

A gauge for checking sizes of mechanical parts, particularly a plug gauge having a support, two measuring arms movable with respect to the support and a transducer for providing a signal responsive to the mutual position of the measuring arms. The measuring arms have tubular end sections defining transversal holes for housing stems carrying feelers for contacting the surface of the part to be checked. Screws coupled with threaded holes axially obtained in the tubular end sections adjustably lock...

A method and apparatus for applying size to an array of fibers of the type in which the array of fibers is directed past at least one nozzle adapted to spray a size onto the array of fibers, wherein the improvement comprises means, positioned immediately upstream from the nozzle, for removing the entrained gases flowing with the array of fibers and a conduit having a decreasing cross sectional area in the downstream direction positioned downstream from the nozzle.

A crystal holder is provided which is capable of supporting any one of a plurality of piezoelectric crystals having different preselected diameters. The crystal holder includes two side portions, each portion having a stair step-like structure, the stair steps of one side portion leading upwardly and away from the stair steps of the remaining side portion. Each step of one side portion is respectively horizontally aligned with a corresponding step of the remaining side portion such that each ste...

A particle size analyzer device for granular and cellular substances composed of particles having sizes lying in a given dimensional range comprises a coherent light source for illuminating a sample of the substance and means for forming the two variable Fourier transform of the sample, i.e. its bidimensional diffraction spectrum. A monodimensional portion of the bidimensional spectrum is isolated along a radius thereof determining an amplitude function versus the radial distance from the center...

This slipper, which may be used in particular as an overshoe and is adaptable to feet of different foot sizes, comprises a series of elastic gathers 27 along the upper edge defining an opening of the slipper and is characterized in that it comprises at least one second series of elastic gathers 28 placed in an intermediate region between the upper edge and the sole of the slipper. Application in protective slippers or overshoes for use over a short period, in particular in the medical, industria...

In an optical instrument for measuring particles in the size range of 0.5 microns to 300 microns, a laser beam is caused to pass through a sample stream of liquid containing particles to be measured. A photodetector detects a portion of the direct laser beam passing through the sample stream and the amplitudes of the pulses generated by this first photodetector provide a measurement of particles in the size range of 10 to 50 microns. A second photodetector detects forward scattered light from th...

A method for, and apparatus for use in connection with, checking the particle size of a powder entrained in a gas stream, comprising separating a sample of the powder into fractions of relatively different particle sizes and comparing the electrostatic or like noises of the fractions.