Schrapnellgranate L/3,7. It was composed by : body with copper driving band, ogival head, three high explosive cases, central tube, bullets, colophan, diaphragm, bursting charge. It was equipped with a quadruple acting fuze. The cartridge was charged with nitro-glycerine powder and was equipped with a screw primer.
The body was made of steel and inside it looked like an ordinary shrapnel, except that the tube connecting the fuze with the base charge was placed on the left hand, whereas in the middle it had two cases containing the high explosive. Outside the copper driving band was pressed into a groove milled near the base. The steel ogival head, containing the fuze, was screwed into the body.
The high explosive, composed by
The base charge (s) was composed by
The special quadruple acting fuze was very similar to Ehrhardt fuze and worked in the same way : time or percussion fuze for shrapnel, percussion fuze with or without delay for H.E. shell. It was made of aluminium and inside was double-banked, the upper level containing the time mechanism (F) and the lower level the percussion mechanism (P). It was equipped both with a delay action mechanism and a safety device against the bursting into the bore.
Operation of the Schrapnellgranate. Firing with time fuze, the burst of the base charge (s) threw the bullets, the head and the two cases containing the explosive without detonating the four bursting charge. The case (D’) fell on the ground without effect, but the head prolonged its flight, keeping its straight trajectory thanks to the case (D), which acted as stabilizer. Hitting the ground or an obstacle, the percussion fuze (P) caused the burst of the charge (o1) and (o2).
Firing with percussion fuze, the charge (o1) detonated, causing at first the detonation of the second charge (o2), then the break of the two cases (D) and (D’), and subsequently the detonation of the charges (o3) and (o4). Finally the base charge (s) detonated and the different parts of the shell burst almost simultaneously.
percussion fire, when the Schrapnellgranate
burst, it produced on the average 79 splinters weighting more than