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Title:2" ROCKET WEAPON PART 8: APPARATUS AD TYPE J MARKS I and II [Main Title]
Film Number:ADM 1171
Summary: (Part Eight only) of Royal Navy instructional film explaining the rôle of the Apparatus Type J Mk. I in protecting shipping from low level aerial attack.
Description: (Reel One.) The apparatus AD Type J is a parachute and cable (PAC) device intended for use against aircraft making sudden, low-level attacks against shipping. A Chief Petty Officer demonstrates the various parts. The weapon has no explosive component, but projects a "lethal wire", suspended by parachute over the ship. The results if an aircraft were to strike the wire are illustrated: the line is designed to catch a passing aircraft and exert a sudden braking effect sufficient to pull it out of control. The launcher, loading procedure and the flight characteristics of the rocket are described. Graphics illustrate the operation of the electrical firing circuit and the projectile's performance and deployment after firing.
(Reel Two) Section titled 'Mis-fires' describes the procedure for approaching a rocket which has misfired, the method of disposal. Section titled 'Handling' gives instructions for daily inspection routine, handling, returning to stores, and weekly, monthly and three monthly maintenance, including field tests for serviceability.