Wochenschau Nebelwerfer 42, 21cm rocket launcher. The name actually implies that it is a smoke launcher, as it was developed during the time when Germany was forbidden to manufacture new arms. There are two versions of this machine: one with six barrels known as type "41" firing 15cm rockets while type "42" has only five barrels (above) which could fire not only the 21cm but the 15cm rockets as well by using a removable rail insert. Both types are on display at the Canadian War Museum, in Ottawa.