British Bomb, 250 lb TI, No. 8 Mk 1, No. 8 Mk 1C, No. 8 Mk 2, No. 8 Mk 3 Spot Fire
Mk I Body - The bomb body, tail plate, and burster are the same as those used in the T.I. Bomb No. 1 Mk I. However, the burster container has a grossed slit on its inner end, filled with solder, to pass the flash from the burster charge to an igniter located in the impregnated bale.
The ejector plate is held by screws against a steel ring welded to the inside edge of the nose. The ejector plate has a central flashhole covered by a thin copper disc, which has two crossed slits filled with solder. Three locating pins are welded to the ejector plate, and locate the bale igniter centrally over the flash hole.
The filling bale consists of rolled cotton wool enclosed in cheesecloth, and held together by wire and steel bands. Six wooden battens extend from the ejector plate to the tail plate and serve to force off the tail plate when the bomb functions.
The igniter at the nose end of the bale consist of an igniter base into which a tube filled with incendiary composition is screwed. A central hole in the igniter base is located above the flash hole in the ejector plate, and has a similar closing disc of copper with a solder filled cross slit.
A diaphragm, soldered to the bomb body under the tail plate, holds the bale in place.
Mark II Body - The Bomb Mk II differs from the Mark I only in general body construction, as the T.I. Bomb No. 1 Mk II differs from the No. 1 Mk I.
Mk III Body - The Bomb Mk III is similar in body and tail plate construction to the T.I. Bomb No. 1 Mk III. The internal arrangement of the filling is similar to that in the Bomb No. 8 Mk 1. However, as this bomb is arranged for tail fuzing, a length of instantaneous fuse leads from the tail fuze pocket, through a st.eel tube located along the inside of the bomb body, and into the forward end of the burster container. A burster capsule is attached to each end of the fuze.
Mk IC Body - The Mk IC bomb differs from the Mk III as the T.I. Bomb No. 1 Mk IC differs from the No. 1 Mk III.
Tail Construction: Same as for the T.I. Bomb Tails No. 1.
The bomb is suspended by a single lug. which is welded to the body.