DECIMAL CLASSIFICATION 
644 Heat Light Ventilation 
T Systems of heating 
Desiderata, relativ advantages for household 
Tor varieties of apparatus and installation see 697; for sanitary engineering 
see 628.8 
Fireplaces Family harthstone 
Open fire as household institution; mental influence 
Sanitary advantages. See also 749 Artistic fireplaces 
Portable heaters: bedwarmers, warming pans, footwarmers 
Fuels 
Relativ cost; cleanliness; labor involvd, e.g. hauling and carrying wood or coal 
and removing ashes. Chimney sweeping 
Wood 
Coal 
Oil, gasoline, etc. 
Gas 
Electricity 
Systems of lighting 
Pixtures, fittings, accessories. Clas here general discussion covering fixtures 
and medium, their relativ advantages, etc. For medium alone see 644.31; for 
fixtures see 644.32 
Lighting medium 
See also Chemic technology 665 
Candles 
Oil 
Gas 
Acetylene 
Electricity 
See also 621.32 Electric lighting 
Other 
Apparatus and accessories 
Subdivide each, if wisht, like 644.31 
Hand lamps Candlesticks 
Lanterns 
Table, banquet and piano lamps 
Standards 
Wall lamps Sconces 
Chandeliers Ceiling fixtures 
Ventilation 
Most material belongs elsewhere: hygienic influence of air and light 613.1, 
ganitary engineering 628.8; ventilating apparatus 697.0. For advantages of 
Breplaceg see 644.15 
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