Show made to order gravel for ships the majority of contractors have to take tahe gravel as they find it and geologists tell us it was a long time in the making it seems that it may no 10 longer tiger be necessary to wait for nature to form gravel from clay but that it may be made when and where wanted arid and tile the method li Is described la in a recent nui number riber of little journal it seems that there was no gravel to be found near the location of a southern shipyard where concrete ships were to be built F fortunately clays were found to possess tile necessary characteristics c te to enable them to be burned to hard though porous lumps and a second series ot of experiments experiment A showed that when the rate ind anil temperature of burning wals controlled it was possible to produce lumps of the desired size |