A thermometer G indicates the boiling-point.
In Fig. 4552, an inner tube is weighted to balance a column of water of known hight and density, and rests upon a flexible diaphragm, through which the pressure of the water is transmitted.
Variations of pressure are indicated by an index connected with the upper end of the tube and traversing the dial.
A vessel into which water from the boiler is drawn, in order to be tested by the salinometer.
In Sewell's, the water entering at the inductionpipe a is received in the outer chamber B, and thence passes downward and around the lower edge of the inner chamber C, so as to prevent a scalding jet flying out at the top.
（Dentistry.) A device to remove the saliva from the mouth during dental operations.
The tongue and cheeks are kept from contact with the teeth of the lower jaw, and the saliva drawn off by an air-pump through a perforated