to keep the water at bay. This we can do by attaching a tube to the tap (Fig. 160) and blowing into the tumbler till the air-pressure exceeds that of the water, which is shown by bubbles rising to the surface. The diving-bell therefore has attached to it a hose through which air is forced by pumps from the atmosphere above, at a pressure sufficient to keep the water out of the bell. This pumping of air also maintains a fresh supply of oxygen for the workers.
Dentro de la campana hay aparejos para sujetar cualquier objeto que deba ser movido, como un pesado bloque de piedra. La campana de buceo se utiliza principalmente para la colocación de mampostería submarina. > "La campana, suspendida ya sea de una grúa sobre la mampostería ya construida a flor de agua,