Abstract: A kit for connecting and sealing a manhole cover frame to the upper surface of a chimney and a method of using the kit. The kit contains a spacer which may be cut to the proper length and to make allowances for any grade in the surface, a top flange which holds the top of the spacer to the manhole cover frame, and a bottom flange which holds the spacer to the upper surface of the chimney. The surfaces of the flanges which contact the lower surface manhole cover frame and the upper surface of the chimney contain coaxial recesses for holding butyl rubber sealant material in rope form. Watertight seals may be made with the use of light pressure. Additionally, the lower flange may be connected to the chimney with bolts. The surfaces of the flanges contacting the spacer contain a plurality of coaxial protrusions. The ends of the spacer are fitted with gaskets and sealed into the spaces between the protrusions on the top and bottom flanges to form watertight seals.

Abstract: An initiating device which employs discardable arming members is disclosed. The design qualifies as a low cost, responsive, impact initiating system for a practice projectile. The method is embodied in a sub-caliber flight projectile as part of a mortar training device.

Abstract: This disclosure relates to a large caliber, thinwall, cargo carrying, spin stabilized projectile of a type in which cargo is keyed to a projectile base member in order to preclude relative rotation between cargo and projectile during in-bore travel. In particular, the disclosure is directed toward an improved base closure method for the projectile including a method for transmitting in-bore torque through a base closure joint.

Abstract: A mortar training device which includes full-size, simulated, propelling charges is disclosed. The device enables a trainee to subtract simulated charges, as required, to achieve a desired zone of reduced firing distance, following procedures similar to those used with standard service ammunition. The method is embodied in a sabot projectile having a sub-caliber flight projectile. The system provides zones of firing distance which are approximately one-tenth that of standard service ammunition.