British Bomb, 10 lb Practice, Mk 1, Mk 2, Mk 3
The bomb has a solid cast iron nose with an axial bore housing the striker head and rod, with a guide bush threaded into the rear cavity, and internal rear threads to take the central plug. The striker is retained by a cotter pin (removed when loaded on aircraft), safety pin, and shear wire extending through the striker rod and guide bush. The central plug houses the central burster tube.
The tail cone is closed at the rear by a conical tail plug, and at the front end by the central plug to which it is attached. The central tube extends through the tail cone to the tail plug, and holds the detonator burster. A tapped hole, fitted with a plug, is provided in the central plug for filling. The tail tube, with four fins carrying a cylindrical strut, projects from tail plug. Its rear end is closed by a cap.
The bomb is suspended by a single eyebolt, which screws into the bomb body opposite the cavity for suspension from a Light Series bomb carrier.
The Bomb Mk I with its smoke filling is used for daytime practice operations. The Bomb Mk III with its flash filling is used at night. These bombs, because of the solid iron nose, should not be used against lightly armored targets.
Mk II had a plastic tail, but was not satisfactory ; so all were scrapped.