MACHINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only ENGINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only PUMPS positive displacement rotary or oscillating piston reciprocating piston or other non-positive displacement Attention is drawn to Note (2) following the title of subclass . MODE OF OPERATION Compression type characterised by the cycle , characterised by the arrangement self-contained rotary; with several evaporation circuits; with several condenser circuits; with cascade operation ; ; ; characterised by the refrigerant using turbines Sorption type , Other types having a single mode of operation, using: evaporation without recovery; electric or magnetic effects; other effect ; ; Combinations: of above modes of operation; of heating and refrigerating ; Heat pumps Using special energy source DETAILS, ARRANGEMENTS, OR COMPONENTS Components: boilers, analysers, rectifiers; boiler-absorbers; absorbers, adsorbers; evaporators, condensers; subcoolers, desuper- heaters, superheaters ; ; ; ; Arrangements compressor arrangement; fluid circulation; separating or purifying gases ; ; for charging or discharging refrigerant; for combating corrosion or deposits ; Mounting of control and safety devices In this subclass, the following term is used with the meaning indicated: "ice" means any frozen liquid and also covers frozen semiliquids or pasty substances. In this subclass, the following term is used with the meaning indicated: "device" means an enclosed space to be cooled; such devices being associated either with refrigerating machinery, e.g. in a refrigerator, or with other cold sources, e.g. in an ice-box. Attention is drawn to Note (2) following the title of subclass . DEVICES NOT ASSOCIATED WITH REFRIGERATING MACHINERY Using cold air or water; other cold materials or bodies ; Using endothermic chemical reactions, or evaporation without recovery , Other devices, combinations DEVICES ASSOCIATED WITH REFRIGERATING MACHINERY: SELF-CONTAINED MOVABLE; STATIONARY; OTHER ; ; , STRUCTURAL PARTS OR ARRANGEMENTS, OF GENERAL APPLICATION: GENERAL; DEFROSTING; HANDLING OF ARTICLES TO BE COOLED ; ; CIRCULATING COOLING FLUID OR GAS; LIGHTING ; ARRANGEMENT OR MOUNTING: OF REFRIGERATION UNITS; OF CONTROL OR SAFETY DEVICES ; OTHER APPARATUS