Sanitary engineering in India : for the use of municipalities and engineers / by John Wallace.

  • Wallace, John.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Sanitary engineering in India : for the use of municipalities and engineers / by John Wallace. Source: Wellcome Collection.

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    108 hot filters warming the air as it passes through them to the house. When the exterior has been properly attended to, the interior temperature and the ventilation are much more manageable. Owing to the small difference which often exists between the air inside and outside of a house, openings for ventilation should be as much as possible at the highest part of the building, and with vertical passages, so that as soon as the outer temperature falls below that of the house in the evening, the warm air from within may escape rapidly. A house of the bungalow type, already described, should have one or more large dormer windows facing away from the direction of the monsoon rains, and furnished with shutters that will open and close tight. All the rooms should have openings in the ceiling of not less than four square feet of area, protected by wire netting, through which all hot air would drain and escape. With such openings for the ready escape of hot air, lamps would assist in the ventilation of the rooms. General Morin, in his Etudes sur la Ventilation, says that one cubic foot of coal gas when burnt will produce heat enough to circulate 1,000 cubic feet of air in a shaft. A lamp of 32-candle power burning for four hours would (p. 180) produce light equal to 10 feet of gas burned in one hour, and each foot of gas would yield 696 Units of heat, or 6,960 Units in all. But kerosine in relation to coal gas, for a given amount of light, only develops heat at the rate of 29 to 47. Therefore. 6960x29^-47 = 4294 Units, the amount of heat developed in four hours by a 32-candle power kerosine lamp. And 4294-^696x 1000 = 6170, or the quantity of air in cubic feet that the lamp would put in circulation. Lateral