Abstract: A technique for detecting and eliminating "sea-spike" interference in a rrn radar-signal. A series of signal delay means in cooperation with associated subtractors are utilized to detect particular sea-spike modulation interference frequencies. Detection of these modulation frequency components causes activation of means for preventing the sea-spike contaminated return signal from being further processed.

Abstract: 1. An electrical system for checking the operational state of a plurality transmitters comprising,A. signal generating means,B. signal applying means for sequentially applying the output of said signal generating means to said plurality of transmitters,C. means for radiating the output of each of said transmitters,D. means for receiving the radiated energy,E. a coincidence detector,F. means for connecting said coincidence detector between said signal generating means and said receiving means, andG. an alarm circuit connected to said coincidence detector, whereby said alarm circuit will be actuated in the absence of a coincidence condition in said detector between the signal received from said generating means and the signal from said receiving means.

Abstract: A range-determining circuit which counts the time from the transmission of detection-signal to its echo return, in units corresponding directly to the distance that the detection signal travels.

Abstract: A sustained constant load cantilever loading type specimen testing machine. he machine includes a rigid grip which grips one end of a specimen. The other end of the specimen is secured rigidly to a cantilever. A hydraulic piston is connected to the cantilever and operated by a hydraulic pump. The load is measured by a calibrated load cell. Auxiliary equipment such as an electrical timer, control switches and safety switches are used for operation of the system.

Abstract: A method of mounting silicon solar cells in a planar array that not only lds electrical insulation between cells but allows for a multifold increase in thermal dissipation of the cell array, comprising metallizing a wafer of beryllium oxide on each side so that the outer surface is copper, etching the wafer on one side so that the only metallized parts which remain are those on which the solar cells are to be mounted or wiring is to be attached, soldering the solar cells on the unetched copper prominences, coating the aluminum panel on which the cells are mounted with a copper layer, soldering the underside of the wafer on the upper surface of the aluminum panel with soft solder such as indium, and covering all remaining passive surfaces with a teflon F.E.P. tape the underside of which carries a layer of slver and then a layer of inconel metal.

Abstract: An improved device and technique for improving the reception of very low quency and low frequency transmissions in seawater. A loop antenna, wound on a ferrite core, is encapsulated in a water impermeable housing. Non-conducting elements are attached to the housing and extend outwardly therefrom to serve as barriers to conduction currents in the seawater. By varying the dimensions and number of the non-conducting members, the quality factor of the loop antenna can be increased to provide improved reception of VLF/LF signals.

Abstract: A method of forming parallel aligned chrysotile asbestos fibers on a thin bstrate for use in a system for identifying the chrysotile asbestos in air pollution samples. The system comprises a collimated x-ray beam which is incident on the parallel aligned asbestos fibers. Diffracted x-rays are detected by an adjustable proportional counter set at the diffraction line position for the (002) plane. Background intensity may be detected by a second adjustable counter set above the axis at the same angle 2.theta., or the sample may be rotated 90.degree. and the one detector used to detect diffracted and background x-rays.

Abstract: Stress free films of metals, semi-conductors and insulators which have a very uniform thickness and composition and which are supported independent of a substrate, and the method of forming same. Such films have wide application for reflection of light as mirrors and transmission or absorption of light in the form of filters throughout the complete optical spectrum. Also, such films may be used for the study of fundamental properties of the material in question.

Abstract: A coating composition containing the active ingredient N,N-diglycidyl-2,4tribromoaniline which is used to suppress combustion of titanium metal.

Abstract: A biased sequence of binary bits is produced such that the probability that any randomly selected bit will be a "1" is equal to a preselected desired number.

Abstract: Detection of a class of input-signal pulse-sequences is accomplished by carison of the signal as sampled and digitally coded twice per pulse-width with a similarly sampled reference signal also digitally coded, but having an arbitrary complementary digital pair in pulse positions whose information content is of no concern.