Comparable numerals of reference are utilized to demonstrate relating parts all through the few figures of the drawings. The different working pieces of the appara tus are upheld on an appropriate casing 10, which likewise conveys a container 11, to which thematerial for the arrangement of the blocks is Supplied. The casing is provided with orientation for the furthest edge gudgeons 15 of a revoluble shape chamber 16, the last being given various molds 17, of which four are displayed in the current occurrence, these being organized at points of ninety degrees from one another. In every one of the form boxes is a

base plate 18, the polar went against plates being associated two by two by bars 19, so
that development granted to one will be sent to the next. One of the end gudgeons is reached out to a point some dis
tance past the side of the casing and vehicle ries a wrench wheel 20, with which draws in a pawl 21, conveyed by an arm. 22, that is turn partner mounted on the gudgeon, and said pawl bestows to the wrench wheel a development through a bend of ninety degrees at each operation eration.