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.

Corrosion experiments with gaseous boron trifluoride

Abstract: A number of constructional materials—metals, alloys and miscellaneous compounds—which may be required to come into contact with boron trifluoride were subjected to treatment with this gas under carefully controlled conditions. The materials were examined by bringing into contact with gas at an original fixed pressure of about 25 cm. of mercury, and at temperatures up to 200° c. The extent of the reaction, if any, was shown by the alteration of the gas pressure over the sample. Many of the materials examined showed a high resistance to chemical attack by boron trifluoride. The following materials can be safely used in apparatus for handling dry boron trifluoride : stainless steel, mild steel, copper, nickel, Monel metal, brass and aluminium, the more noble metals up to at least 200° c.; Pyrex glass is also suitable up to about 200° c.; Araldite cement, fired pyrophyllite and polytetrafluoroethylene may be used up to 80° c. Great variation was shown by the others in the miscellaneous group of compounds.

A Rapid Method of obtaining Nuclear Magnetic Resonance Spectrograms

Abstract: TORREY1 has discussed the possibilities of using a relatively rapid approach to resonant conditions as a method of searching for unknown nuclear resonances, and has described methods in which H 1 (the radio-frequency field) has been pulsed. Where the establishment of resonance conditions is rapid compared with the spin-lattice relaxation time, this method gives theoretically a larger nuclear signal than that available in cases where the resonance is excited continuously or frequently. We have found that a method whereby H 1 is fixed and H 0 (the D.c. magnetic field) is rapidly swept over a relatively wide range provides not only a simple method of demonstrating nuclear resonance effects, but also one that has possibilities in rapid searching for unknown resonances.

The scattering of gamma-rays in extended media. iii. problems with spherical symmetry

Abstract: Some typical problems of the propagation of gamma-radiation in an extended scattering medium have been solved for pure Compton scattering, which is a good approximation for most materials at gamma-ray energies up to a few MeV. The effects to be expected from air gaps round the source, large source dimensions, and plane absorbing materials are demonstrated.

The Vertical Reference in Aircraft

Abstract: This paper will discuss various methods of defining the vertical in aircraft. It is unrealistic to examine the vertical in navigation only in terms of providing a reference for sextant altitude measurement and the paper will therefore discuss more general problems of aircraft stability, which can themselves to some extent be studied by means of the sextant.