Fuzes: Both bombs are fuzed in the nose only, with standard Navy nose fuzing, without delay.

Color and markings: Gray over all with a green tipped nose and a yellow band aft of the green. Yellow band on the tail.

Type of filling: Mustard thickened with metha crylates and poly-vinyl alcohols.

General description: The chemical filling for these bombs are contained in cans which fits inside the bomb casing, and are sealed in place with paraffin. Two cans were used for each bomb; a conical can which fits into the tail cone, and a cylindrical can with a channel down its center to provide space for the central explosive burster charge. Besi-des the central burster charge, a nose charge is provided, separated from the forward end of the gas containers by a spacer disk. The nose charge is designed to have the ef-fect of forcing the spacer disk and chemical filling back out of the crater, and help to spread it.

Type 4 No. 6 Mk 1

General description: This bomb was designed to take the place of both of the impro-vised No. 6 Mk 1 land, and type 1 No. 6 Mk 1 land, bombs. It is wooden construction throughout to save steel, and proves itself equal to the other two bombs in effective-ness in Japanese tests. Exact dimensions are not available, but the following data is known.

The barrel nose section, and tail fins of the bomb are constructed of light plywood, mol-ded into proper charge. A steel adapter is provided in the nose to take a standard Navy instantaneous fuze and gaine. The barrel of the bomb is cylindrical, with no cone at the tail. It is reinforced with bands of plywood. The tail fins are of standard shape, and are braced with steel struts. The nose section of the bomb is a wooden block, slightly roun-ded, and fitted into the barrel.

Chemical filling for the bomb is contained in a cylindrical can with a central pocket at its forward end to receive the central burster charge. At the forward end of the filling can is a spacer disk. An explosive nose charge is provided at the extreme forward end of the bomb and extends back through the spacer disk and into the central pocket in the che-mical filling can. It is designed to prevent the chemical filling from collecting in the crater, and to spread it.

Remarks: These bombs are capable of being filling with any suitable gas, although the standard filling is mustard gas. According to Japanese statement, attempts by Japanese chemists to produce new types of failed to improve on types already in common produc-tion.

The Mk 1 bombs have never been recovered outside of the Japanese homeland, indicat-ing that there was never any immediate intention of their use, and the small number of bombs of this type found in Japan indicates that the Japanese were inadequately prepa-red to intiate gas warfare.

The data on these bombs is the result of incomplete investigation, and must not be con-sidered as specific, accurate information.

Figure 46 - No. 6 Mk 1, Type 1 No. 6 Mk 1, and
Type 4 No. 6 Mk 1 Bombs.