![]() This simple method of immunising did not last long as the Germans brought out a No 25 fuze. This allowed the electrical charge in the firing condenser to leak back to earth, thus making it inert – and safe. These first fuzes were all No 15 and it was discovered that they could be immunised merely by depressing the plungers, in the top of the fuze, a few times. This august body, apart from finding out how each new fuze discovered, worked and developing a method of immunising also designed the necessary equipment and authorised its manufacture. The fuzes were sent to the Research and Experimental Branch of the Ministry of Supply who discovered that they were ECR (electrical condenser resistance). It was soon realised that any bomb dropped in an urban area would have to be immunised and could not be blown up in situ. ![]() They were 50kg and had penetrated to a depth of between six to ten feet. The four bombs were recovered by the RAF based at Sullom Voe. The first unexploded bombs fell on the Shetlands in November 1939. ![]() ![]() ![]() The first bombs to be dropped on the UK were at Hoy, in the Orkneys in October 1939. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |