Accession Number:

ADA495309

Title:

Studies in Ignition in S.A.A. Part 3. The Effect of Determination of Cap Composition of the Firing Characteristics

Descriptive Note:

Corporate Author:

MINISTRY OF SUPPLY LONDON (UNITED KINGDOM) DIRECTORATE OF ARMAMENT RESEARCH AND DEVELOPMENT (AIR)

Personal Author(s):

Report Date:

1947-08-01

Pagination or Media Count:

14.0

Abstract:

A study has been made of the incidence of hangfires in relation to deterioration and charge weight of S.A.A. caps filled with mercury fulminate compositions. It has been found that a simple relationship can be established between the weight of fulminate originally present in the cap, the percentage drop in fulminate content on storage and the incidence of hangfires. It is found that there is an optimum size of cap. Below this size failure will occur progressively sooner as the cap size decreases. Any increase on this size is unnecessary from the point of view of keeping quality though other consideration my call for a larger cap. A mathematical relationship connecting the three variables has been deduced. The meaning of the temperature coefficient of the decomposition of mercury fulminate in cap compositions has been reconsidered and certain considerations which effect the accuracy of prediction of service life of S.A.A. are discussed.

Subject Categories:

  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE