manostatn.

1900 Jrnl. Physical Chem. 4 546 (title) On a manostat.

1923 R. Glazebrook Dict. Appl. Physics III. 191/2 The majority of manostats are designed on the broad principle that whenever the pressure departs from the desired constant value, the manometer itself, through the change in liquid level in one of its limbs, automatically actuates either a supply or removal of gas..or else some equivalent means of restoring the desired pressure.

1966 Encycl. Industr. Chem. Analysis I. 617 As a general rule, manostats controlling four fixed pressures of 10, 50, 100, and 200 Torr, and accurately adjusted to these pressures, provide a range of operating pressures quite adequate for every distillation situation.

1984 Delft Progress Rep. 9 173 The manostat apparatus described is able to maintain a pressure constancy commensurate with the sensitivity of the dead weight pressure gauge.