Ministry of Supply

About: Ministry of Supply is a based out in . It is known for research contribution in the topics: Polarography & Bacillus (shape). The organization has 416 authors who have published 355 publications receiving 8951 citations. The organization is also known as: MoS.

A Constant Stress Apparatus for the Study of the Creep Properties of Plastics

Abstract: A constant stress extension apparatus designed to measure extension-time curves for plastics for which Poisson's ratio may be taken as 0.5 is described. Extension up to 50% can be measured, and the provision of low- and high-magnification optical lever systems for measurement of the extension enables small and large movements to be measured. The constant stress is obtained by means of a cam, the shape of which has been computed. Some preliminary results are given of the behaviour of a nitrocellulose plastic, in order to illustrate the use of the instrument. This material does not obey the `Boltzmann Superposition Principle' for large stresses.

Performance dress shirt

Abstract: The invention relates to a performance dress shirt and methods of manufacture. In embodiments, the performance dress shirt includes a front portion made of a first material, a back portion having outer sections made of a first material and an inner section made of a different second material coupled to the front portion and two sleeves made of the first material coupled substantially opposite each other to the front portion and the back portion. In other embodiments, the performance dress shirt has a front portion, a back portion coupled to the first portion, and two sleeves coupled substantially opposite each other to the front portion and the back portion. Each of the front portion, the back portion, and the sleeves have an interior layer and an exterior layer, with the interior layer having a smaller pore structure than the exterior layer.

Measurements of the effect of rain, snow and fogs on 8.6 mm radar echoes

Abstract: A radar set has been used to investigate the propagation of 8.6 mm radiation through various types of weather. Measurements have been made of the attenuation caused by the precipitation particles and of the intensity of radiation scattered back. No attempt has been made to correlate the results obtained with drop-size distribution, but the results are plotted against precipitation rate.The attenuation caused by rain and the intensity of radiation scattered back by rain agreed well with theoretical predictions.The echo intensity from fogs was too low to be detected, but the attenuation of a corner-reflector echo was measured in several fogs of different visibilities. While the results were of the same order as those predicted by theory, there was some variation, especially for fogs causing low visibility.The attenuation caused by dry snow has not been measured, but moist snow produced attenuation two and half times greater than rain of similar precipitation rate. The echo intensity returned from the “radar bright band,” composed of melting snow, was 14–19 dB more than the echo intensity from the dry snow above it, and 2–8 dB more than the echo intensity from the rain below it.

Intensities of Discrete Radio Sources in Cygnus and Cassiopeia at 22.6 Mc.s.

Abstract: IT is important both for the understanding of the nature of the localized radio sources and the determination of interstellar radio absorption to extend the measurement of the spectra of the sources to as low radio-frequencies as possible. Ionospheric transmission sets a limit, but by choosing frequencies not too close to the critical frequency, and restricting observations to days of low ionospheric disturbance, reasonably accurate measurements may be obtained. In this way, we have recently made measurements at a frequency of 22.6 Mc./s. (λ = 13.3.m.) by means of an interferometer consisting of two aerials spaced in the east–west direction at 20 wave-lengths apart, thus producing lobes in the aerial pattern at intervals of about 3°. Each aerial consists of an array of six full-wave dipoles giving a vertically directed beam of width ± 22° and ± 9° in the north–south and east–west directions respectively. The recording apparatus is a simplified form of the type described by Machin, Ryle and Vonberg1, whereby the receiver is continually switched to a standard noise diode source which is automatically adjusted by a servo-mechanism to equalize the received radiation.