Chemistry. An apparatus for heating through the medium of water, sand, etc., more gradually than by direct exposure to fire. Cf. bath, n.1

A mirror or reflector (of glass or metal) used for some scientific purpose; †a lens.

unsized porous paper used to filter liquids; a piece of this; = filter paper n. at filter, n. compounds 2.

in Old Chemistry, a fire completely encompassing a crucible.

unsized porous paper used to filter liquids; a piece of this.

(a) Roman History a south-facing room with glass or mica windows, designed to trap heat (somewhat rare); (b) an apparatus designed to produce…

Chemistry. An apparatus for testing the composition of exhaled air. Obsolete. rare.

a small glass bubble filled with water, which when held in the flame of a candle, bursts with a loud explosion.

Chemistry. An apparatus for purifying or refining a substance, esp. spirit, by distillation. Cf. rectify, v. 3a.

a sphere which explodes in the heat of a candle, giving out a brilliant light.

Any material suitable for use as a filter.

a type of blowpipe in which streams of oxygen and hydrogen meet as they emerge, producing an extremely hot flame by the burning of the hydrogen in…

Something which affords protection from light, heat, etc. In scientific apparatus: a shutter or other mechanical means of intercepting light falling…

One who or that which graduates. A contrivance for concentrating a solution by means of rapid evaporation.

Science. A slender tube of small calibre used for obtaining a known small volume of a liquid, esp. in laboratory work, and often incorporating a…

a kind of funnel used in chemical operations, having a large bulb between the conical flaring part and the tube, so as to suggest the form of a…

A tube containing liquid or gas under pressure.

An apparatus for producing ozone or for treating something with ozone; (also) †a chemical used to generate ozone (obsolete).

Chemistry and Biology. An apparatus containing a semipermeable membrane for the separation of dissolved and suspended substances in a liquid by means…

a device for condensing vapour, consisting of two concentric tubes, the vapour and condensate passing through the inner one and a cooling liquid…

a type of vacuum pump which removes air or gas by trapping it in bubbles between short columns of mercury falling down a narrow vertical tube.

†(a) the vertical tube forming part of a Sprengel pump (obsolete); (b) a glass U-tube that narrows to a capillary at each end, used to determine…

a chemical agent, or a device or apparatus, used in water-softening.

an air pump that makes use of mercury, spec. (a) = Sprengel pump n. at Sprengel, n. 1a; (b) = mercury vapour pump n.

Used attributively to denote appliances invented by Bunsen. a kind of gas-burner used for heating and for blowpipe work, in which air is burnt…

= dialyser, n.

see quot.

(a) a bent glass tube with a stopper at each end through which a smaller tube is passed; (b) in a steam-engine, a condenser in which the cooling…

Used in the possessive (less commonly absol. or attributively) to denote an apparatus for the generation of gas by the action of a liquid on a…

a condenser mounted or designed so that condensed vapour runs back into the stock of boiling liquid.

Science. More fully rubber policeman. A glass rod or tube with a short piece of rubber tubing or other soft attachment on one end, used in the…

An apparatus for converting one thing into another.

a boiler designed to withstand high pressures, for heating liquids above their normal boiling points.

a plate (typically ceramic or plastic) bearing an array of small depressions in which spot tests can be performed.

an electrode (usually of platinum coated with platinum black) partially immersed in a solution that contains hydrogen ions and hydrogen gas, so that…

A device for obtaining samples for scientific study.

A tank, vessel, or apparatus in which substances are made to react chemically, esp. one in an industrial plant.

A proprietary name for: ion-exchange material used for softening water; equipment and processes that employ such material.

a small gas burner.

(a) a tube containing an electrolyte (frequently in the form of a gel) which provides electrical contact between two solutions; (b) a structure…

An apparatus for precipitation; spec. (a) chiefly Chemistry a vessel in which precipitation occurs (now rare); (b) chiefly Engineering an…

a small cylindrical ring usually made of glass, metal, or ceramic material, and used in large numbers as packing in towers and columns for…

a very fine needle used in micromanipulation.

A person who performs titration (rare); (now chiefly) an apparatus used to perform titration automatically.

General attributive, as laboratory apparatus, laboratory chemist, laboratory coat, laboratory experiment, laboratory fire, laboratory machinery, labo…

a hollow tower in which a liquid is made to fall as a spray, e.g. to cool it or to bring it into contact with a gas.

A kind of electrostatic precipitator for removing dust or other particulate matter from ventilating air.

A solid involved or used in ion exchange. Also: an apparatus for effecting ion exchange.

A device for controlling or maintaining constant the potential difference between the electrodes in an electrochemical cell.

A device designed to provide a chemical environment that can be regulated and kept stable over a long period, esp. one used for the continuous…

Oceanography. special type of pipette for use in Knudsen titrations.

a device for automatically maintaining a solution at constant pH.

A vacuum pump in which molecules of gases and vapours are trapped by causing them to condense on a surface maintained at a very low temperature.