During the second half of the nineteenth century the government inspector responsible for explosives factories, dealers, etc published an annual report. I can't remember his correct title or when the publications began, but I have seen several copies of the reports, and in cases of explosions there are detailed accounts of the works, complete with plans. The reports were published as Parliamentary Papers and these are available on microfiche, many universities having copies. Keith Ramsey %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%