Sea Warfare

of the newly discovered mine-area must be fixed and the traffic deviated. There is a tramp outside with tugs in attendance. She has hit something and is leaking badly. Where shall she go? The Office gives her her destination--the harbour is too full for her to settle down here. She swings off between the faithful tugs. Down coast some one asks by wireless if they shall hold up their traffic. It is exactly like a signaller "offering" a train to the next block. "Yes," the Office replies. "Wait a while. If it's what we think, there will be a little delay. If it isn't what we think, there will be a little longer delay." Meantime, sweepers are nosing round the suspected area--"looking for cuckoos' eggs," as a voice suggests; and a patrol-boat lathers her way down coast to catch and stop anything that may be on the move, for skippers are sometimes rather careless. Words begin to drop out of the air into the chart-hung Office. "Six and a half cables south, fifteen east" of something or other. "Mark it well, and tell