 Frank Brock RNVR, its inventor, was a member of the Brock fireworks-making family.Anti-zeppelin missions typically used machine guns loaded with a mixture of Brock bullets containing potassium chlorate, Pomeroy bullets containing dynamite, and Buckingham bullets containing pyrophoric yellow phosphorus.A later incendiary was known as the de Wilde, which had the advantage of leaving no visible trail when fired.