FITTING AND ERECTING 265 should be stopped in order to see that the crane brakes are in order, or that the chain lifting-blocks will not run back. The piece should then be raised another inch, in order to see that the crane can start lifting with the load on it. It is unfortunately too often the case that the controlling arrange- ments of an electrically operated crane will not allow the crane to start against heavy load. 6. The piece should then be lowered an inch, to see that the lowering can be stopped, and that the piece is thus properly under control. By carrying out a few simple precautions of this kind much trouble and damage can be averted, as, if the crane should fail to hold the piece, it can only run down an inch or two at most. 7. When everything is satisfactory, and the brake blocks, &c., adjusted if necessary, the piece can be lifted into position, though care should always be taken when lowering to see that the crane and lifting tackle are not subject to shocks due to suddenly stopping. ^SlBSTv-'