The invention relates to phototubes and in particular to photo multiplier tubes such as those associated with scintillation crystals and which are provided with an array of conductor elements juxtaposed with respect to the photo cathode of the tube and which when subjected to voltage pulsing in a scanning sequence are capable of providing information concerning the spatial distribution of light incident on the photo cathode.

As an improvement over the method of U.S. Pat. No. 3,555,912 which uses flowing mixtures of adsorbate and inert diluent gases to develop surface measurement data, the within improved method further advances this technique by utilizing a cell, which contains the powder sample being measured, of an appropriate design to overcome errors which are found when low surface areas are measured. One optimum consequence using the improved cell hereof is that the measuring gaseous mixture is forced through ...

A device for heating localized areas of horizontally positioned pipe is formed in two complemental semi-annular hollow sections adapted to be fitted around the pipe, the sections being hinged together at the top to open and close with respect to a vertical diametric plane for fitting upon and removal from the pipe. A plurality of gun-type burners carried by the sections are adapted to project flame and heated products of combustion around the surface of the pipe.

A process control system including: controlling, recording and display devices in a control room area; field equipment, cooperating with the process to be controlled, in a hazardous area; and sources of power; wherein the system configuration provides sufficient protection against transmission of dangerous levels of power along the connections to the hazardous area to prevent ignition. The system includes a single bidirectional voltage limiting barrier and a plurality current limiting devices fo...

In the disclosed transducer, a frame supports the edges of a piezopolymer sheet coated on both faces with electrodes, while a holding structure supports an area but leaves a larger area of the central portion of the sheet unsupported. According to preferred embodiments, the frame stretches the sheet, in the form of a membrane, across one or more contact areas on the holding structure, and the contact area approximates a point located near the center of the sheet or a number of concentric annuli....

An apparatus for producing parallel-walled grooves in green areas and lawns. Slits which form the walls of the groove are produced by means of tools which are arranged at the periphery of a drum, or alternatively, on a rolling wheel body. Each tool comprises a pair of knives which produce the parallel slits or cuts. A cutting edge is provided, which extends between the knives and produces a transverse cut in the region of the groove. The cutting edge can simultaneously serve to eject the earth. ...

A lithographic printing plate is prepared from a layer of a photopolymerizable composition comprising an oleophilic macromolecular organic binder and a leachable hydrophilic ethylenically unsaturated compound by e posing the layer and then leaching the compound from the unexposed areas by treating with a suitable developing solvent, preferably water, producing an oleophilic surface. A similar plate may be prepared from a composition containing a hydrophilic binder and oleophilic leachable compou...

A pressure regulating marking on a roadway area is formed by applying onto a surface area a traffic-wear resistant layer having a small thickness and constituted by a pigmented resin material, providing a plurality of retroreflective globules having a minimum dimension which is many times greater than the thickness of the traffic-wear resistant layer, wetting the globules by a wetting resin material which is compatible with the pigmented resin material of the traffic-wear resistant material, and...

Implanted areas are produced on a substrate by irradiating the surface of the substrate with two coherent high kinetic energy beams which are superimposed in relation to one another and spaced from the substrate surface in such a manner that maxima and/or minima of an interference pattern formed by the two particle streams are located on the substrate surface.

A fabric having open areas is knitted from a plurality of body yarns interspersed at intervals with locking yarns having a lower melting temperature by casting off selected loops in selected body yarns, causing the cast-off loops to unravel toward but not past the respective locking yarn, and heating the fabric to cause the locking yarns to fuse to the touching body yarns, thereby preventing the cast-off loops from unraveling past the respective locking yarn.