The instruments the labourers use have to be simple, easily replaceable and cheap. Harvesting opium is a labour intensive task, as it requires each poppy head or pod to be incised several times over a few days. Called Granatwerfer (grenade launcher) by the Germans that massively used it, this light (45 kg) and easily A YABLOCHKOV CANDLE : BSKAMALOV Yablochkov candle with part of the bulb removed to show the two parallel carbon rods separated slightly from each other by a layer of plaster of Paris. At the border between grenade launcher and minenwerfers, the Priest Morser is a little trench weapon designed in 1915 by Austria (presimingly by a priest, hence the name).