606

HISTORY OF ENGINEERING.

Book I.

enclosed in an iron frame, which protects it from injury. The pan and parts connectedwith it are of strong glazed earthenware.

Fig. 566. SECTION OF SOIL PAN, TRAP, BASIN, BTC.

EARTHENWA'

The cells are lighted with gas, and the water-troughs and service-pipe are well contrived.The troughs are of iron, 6 inches in depth and 4^ inches wide; these are cast in lengths of8 feet 6 inches, which correspond with the w’idth of the cell ; they are supported onbrackets, and in order to limit the quantity of water, there is a division to which eachprisoner has access, containing a cubic foot, or six gallons. The troughs are supplied fromcisterns placed on a level with each range.

Fig. 567. GAS LIGHTS AND WATER CISTERNS,

By a reference to the plan of these arrangements it will be seen that the greatesteconomy has been adopted. The pipes are all trapped in such a manner that no effluviacan pass along the soil-pipes or find its entry into the adjoining cell; the party-wallbetween the two is of a sufficient thickness to prevent all sound, and the junction of thetwo wastes takes place on the outside of the building: wherever the water that has beenused for washing or other purposes is allowed to run away, it is made available for puri-fication ; the waste of the wash-hand basin passes through the pan of the closet, which isunited to a D trap.