Safety Fuse

Safety Fuse No. 11 Mks I and II: This fuse consists of a column of fine gunpowder enclosed in a jute yarn coverring coated with bitumen and protected by a varnished black tape. The fuse has a diameter of about 0.21 inches. It burns at about 2 ft. per se-cond and will function under water.

Instantaneous Fuse

Instantaneous Fuse Mk III: This is not a detonating fuse, but it can be ignited by safety fuse or flame, and burns at not less than 90 ft. per second. It is enlcosed in an orange clored tape binding.

Instantaneous Fuse Mk IV: This fuse is similar to the Fuse Mk III, except that it is enclosed in a red colored, waterproof tape.

TNT Instantaneous Detonating Fuse Mk III (F.I.D.): This fuse consists of a lead-and-tin-alloy tube, about 0.23 inches in diameter, filled with specially prepared TNT. It detonates at a rate of about 5,000 meters per second.

Cordeau-Bickford Instantaneous Fuse: This fuse consists of a lead tube completely and uniformly filled with TNT. It detonates at about 4,500 meters per second.

Cordtex Instantaneous Detonating Fuse Mk IV: This fuse consists of a core of P.E.T.N. surrounded by cellophane tape and enclosed in layers of jute and cotton yarn, contained in a tubular covering of waterproof composition, which is aluminum in color. The external diameter is 0.19 inches. The rate of detonation is approximately 20,000 feet per second.

Some issues of Cordtex will be covered with rubberized tape instead of cellophane tape. Packages containing these issues will be marked "R". Packages containing Cordtex covered by plastic instead of bitumen will be marked "P".