MANOMETER n.
An instrument for measuring the tension or elastic force of gases, steam, etc., constructed usually on the principle of allowing the gas to exert its elastic force in raising a column of mercury in an open tube, or in compressing a portion of air or other gas in a closed tube with mercury or other liquid intervening, o…
MUD n.
f numerous species of hymenopterous insects belonging to Pepæus, and allied genera, which construct groups of mud cells, attached, side by side, to stones or to the woodwork of buildings, etc. The female places an egg in each cell, together with spiders or other insects, paralyzed by a sting, to serve as food for the l…
OPEN a.
than a closed pipe of the same length. -- Open-timber roof (Arch.), a roof of which the constructional parts, together with the under side of the covering, or its lining, are treated ornamentally, and left to form the ceiling of an apartment below, as in a church, a public hall, and the like. -- Open vowel or conson…