The German Behelfs-Schutzenmine S. 150, known to allied troops in the field as the “Pot Mine,” “Picric Pot,” “Mustard Pot,” or “Jerry Mine,” consists of a cylindrical body, a top plate, and a crush igniter.
The body, which is made of pressed steel, contains a 5 1/4 oz. explosive charge of powdered picric acid. A chemical crush-actuated igniter is screwed into the mine by means of a brass or plastic adapter which fits into the top of the body. A synthetic rubber washer is provided between igniter and adapter for waterproofing the mine. The igniter, known as the German Buck Igniter (Chemischer Zünder Buck) consists of a thin metal drum with circumferential grooves to reduce its resistance against vertical pressure. It contains a glass ampule half filled with acid and surrounded by a white powdered flash composition. A small brass detonator (German Nr. 8) is inserted into the detonator pocket.
A moderate pressure on the top of the igniter crushes the metal drum and the glass inside it. The acid pours into the white powder, and a flash resulting from their chemical interaction sets off the detonator which in turn sets off the mine.
SPECIFICATIONS
| Height of body | 2 ins. | |
| Diameter of body | 2 1/2 ins. | |
| Diameter of top plate | 3 ins. | |
| Height of igniter | 1 1/2 ins. | |
| Diameter of igniter | 3/4 in. | |
| Depth of detonator pocket | 1 1/2 ins. | |
| Total weight | 12 1/2 ozs. | |
| Weight of igniter with adapter | 1 oz. | |
| Explosive charge | Powered picric acid (5 1/4 oz. approx.) | |
| Color | Mustard brown |
German: p. 304.7