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.

    217/300 (page 189)
    the walls were made sufficiently thick and the circulation of air were stopped, a true average temperature would be the result. The use of punkahs in a closed inhabited room facilitates the escape of animal heat from the body, but as they only agitate without renewing the air, there is a gradual increase of impurity from the time the room is closed until it is opened. When long continued, this practice must be injurious to the health. The kuskus screen is a means of cooling and moisten- ing hot dry day, in common use in India. When placed against a doorway on the windward side of a house, and constantly wet, a great reduction of temperature takes place in the air which passes through. The Thermantidote is an elaboration of the kuskus screen or tatty. A ventilating fan is combined with the screen and a small pump, so that air is drawn into the fan through the wet screen and blown into the ho use, cooled and moistened. The Thermantidote being only used during one part of the year is frequently left in a corner—often exposed to the sun and the rain—until needed again. It is driven when out of adjustment, and usually gives a much smaller result for the power em- ployed to drive it than the punkah. It is too compli- cated for the class of men who have charge of it. The fan wheel should be of such a diameter as to drive direct from its own axle without the belt or tooth gearing that gives so much trouble. Many charges are laid against the Thermantidote, of injury to the health of those who use it—or who, properly speaking, abuse it. No note is taken of the amount of humidity or difference of temperature of the air it discharges, nor of the velocity of the current.