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.

Principles and Practice Governing Interchangeability and the Specification of Manufacturing Limits of Size, as Influenced by Statistical Considerations:

Abstract: This paper begins with a general summary of the problem of interpreting interchangeability and a limit of size; the general nature of a fit and of the limits of size which determine it are briefly examined. Some statistical problems of assembly and inspection and their effects on interchangeability and on the practical interpretation of a limit of size are investigated. The standard of measurement is considered in some detail as defining gauge tolerances and errors of measurement, and as giving guidance in relation to certain varying degrees of interchangeability that have been shown to exist. The effect of these arguments on the standard of limits and fits is discussed and certain practical pitfalls in the statistical arguments are briefly examined. Low degrees of interchangeability are discussed and also interchangeability in relation to complex forms, position, and angular dimension. It is shown how the various degrees of interchangeability can be indicated by means of suitable provisions in the standa...

Design of packed distillation columns. II. Operating vapour rates for packed distillation columns

Abstract: Relatively simple correlations of the important variables associated with allowable vapour rates in packed columns are presented. These are similar to those already used for the same purpose in connexion with plate columns. The suggested method of calculation of limiting velocity is simpler than those methods derived from correlations of a more complex type which are described in the literature on packed columns; it is nevertheless adequate for preliminary design of columns operating at atmospheric pressure or below.

Mutual impedance and self-impedance of coupled parallel aerials

Abstract: The paper describes an experimental investigation of the problem of mutual and self-impedances of coupled cylindrical aerials. It is shown that mutual-impedance values, calculated on the assumption that the aerial current distribution is sinusoidal, can be used with some success if appropriate values of self-impedance are used. An approximate method for finding these impedances is suggested.

Methods op burnins rate control in solid propellants

Abstract: The experimental methods used for determining the burning rates of solid propellants at rocket pressures are briefly described The two main classes of solid propellant, namely double base and composite are then discussed The relationships between burning rate and chemical composition for both classes are considered, and the effects of operating pressure, temperature, and erosion on propellant burning are reviewed In the composite propellant field, particular mention is made of pressed charges based on ammonium nitrate as the oxidizer, and on plastic propellants based on ammonium perchlorate as the oxidizer Present limitations on burning rates are discussed, and the modification of burning rate by the addition of lower energy materials, such as dinitrotoluene or ammonium picrate, is mentioned The stabilization of burning at low pressures by the addition of potassium cryolite, or other refractory materials, is considered Recent published papers on solid propellant burning rates and on the mechanisms proposed for the combustion of the various types of solid propellants are reviewed