The cartridge is of the separate loading Q.F. type and is used in the 10.5 cm gun "s. 10 cm K. 18". The case, 17.5 inches in length, is fitted with a C/12 n.A. percussion primer and normally contains section No. 1 and No. 2 of the propellant charge, the mouth being closed for packing and transport by a grey steel cap. A super charge, numbered "3 DR", is packed separately in a container marked "Sonderkart. 3 s. 10 cm K. 18" and is used in the case in place of section 1 and 2 when required. The model number of the case, "6349", and the abbreviated designation of the equipment, "s. 10 cm K. 18", are stamped in the base of the case. The marking "P.T. + 25° C", indicating the standard charge tem-perature on which the weight of the charge is based, is stencilled in red on the base of the case.

Sections 1 and 2 of the propellant are each contained in a bag of artifical silk. The two bags, arranged side by side, protrude from the mouth of the case and are choked at the neck. The bag containing No. 1 section has a comparatively large igniter sewn lightly to the base. The numerals of the sections are marked prominently in black near the top of each of the bags. The bag No. 1 section, which is the larger of the two, bears the fol-lowing markings in black:– "s. 10 cm K. 18 2,375 kg Digl.R.P. – G 0.5 – (450 x 3,1/5)" and, in red "P.T. + 25° C". The markings on the bag of No. 2 section differs only in the weight of the section which is "910 g" instead of "2,375 kg".

The propellant, as indicated by the markings, is of double base composition (nitrocellu-lose and diethylene-glycoldinitrate) in tubular form. The dimensions of the tubes being length 17.7 inches, external diameter 0.122 and internal 0.059 inches. The charge weights being, section No. 1, 5 lb. 3 oz. 11 dr. and section No. 2, 2 lb. 0 oz. 1 1/2 dr.

The igniter, attached to the base of No. 1 section by a few stitches, is sufficiently large in diameter and is attached in such a way that it also fits under the base end of No. 2 section. The following marking appears on the igniter:– "s. 10 cm K. 18, 40 g Nz.Man.N.P. (1,5 x 1,5), 35 g Ngl.Bl.P. – 12,5 – (40 x 40 x 0,2)". These markings indicate a filling con-sisting of 1 oz. 6 1/2 dr. of nitrocellulose powder (including potassium nitrate) and 1 oz. 3 3/4 dr. of double base (nitroglycerine and nitrocellulose) propellant. The N.C. powder is in the form of granular cylindrical pellets 0.06 inch long and 0.06 inch in diameter. The double base propellant is in the form of square flake, the dimensions being 1.6 x 1.6 x 0.08 inches. The two fillings are separated by a disc of artifical silk sewn between the upper and lower discs of the igniter, the N.C. powder being nearest the primer. In some instances the igniter contains only the 1 oz. 6 1/2 dr. filling of N.C. powder and the marking relating to the double base composition does not appear on the base.

The transit cap fitted over the protruding charge sections and the mouth of the case has two paper labels at the top. One is worded to the effect that the igniter with an ad-ditional filling is sewn No. 1 section of the charge. The other gives the weight, nature and size of the propellant charge and the igniter filling. Stencilling in white on the side of the cap is to the effect that the cap is not for firing, and in some instances, that the cap is only for brass case. The standard charge temperature is also stencilled in red on the side of the cap.

This charge is packed in a cylindrical container made of rolled paper and is inserted in the case in place of sections No. 1 and No. 2 when required. The white artifical silk bag con-taining the charge is approximately 30 inches long and 4 inches in diameter with an igni-ter at the base. The bag is choked at the top and is marked prominently in black "3 DR (gr.Ldg.)". The following markings relating to the propellant charge are also black but in smaller lettering:– "s. 10 cm K. 18 5,800 kg Digl.R.P. – G2 – (750 x 5,9/3)". The marking "P.T. + 25° C", is also on the side of the bag in red.

The 12 lb. 12 oz. 8 dr. propellant charge, as indicated by the markings, is a double base composition consisting of diethylene glycoldinitrate and nitrocellulose and is in tubular form. The dimensions of the tubular cords are:– length 29.53 inches, external diameter 0.232 inch, internal diameter 0.118 inch.

The flat circular igniter stitched to the base to the bag is marked "s. 10 cm K. 18 u. lg. 10 cm K.T., 35 g Ngl.Bl.P. – 12,5 – (40 x 40 x 0,2)" indicating a filling of the same weight and composition as that of the square flake in the igniter attached to No. 1 section.