82 ^iA'ATOMICAL TECHNOLOGY. 



or zinc, never of wood or tin ware. The cover should "be of the 

 same material, and fit closely. The pail should l)e emptied at 

 night, rinsed, and a few cc. of permanganate of potash solution 

 poured into it. Once a week it should be thoroughly scoured and 

 dried. 



§ 196. Waste Pit. — The single student may readily dispose of 

 the refuse of his work, but some special provision must be made 

 for a laboratory. 



In cities, communication may sometimes be had with the sewer. 

 The opening into the sewer should have at least two lids, closely 

 fitting, and should be within a closet or cupboard provided with a 

 special flue so that the sewer gas may not be drawn into the labo- 

 ratory. 



In smaller towns, and at many universities, the readiest mode 

 of disjjosal of refuse is to have a pit dug in dry soil at a convenient 

 distance. The mouth of the pit should be kept from falling in by a 

 cask or box, and should be closely covered. The earth removed 

 in digging the pit should be kept at hand under cover, and some of 

 it sprinkled over the offal at night. When fiUed within half a meter 

 of the surface, the pit should be filled up compactly with earth. 



§ 197. Sink. — This should be of iron, galvanized iron, zinc or 

 copper, or lined with one of these materials. It should be slightly 

 inclined, the outlet should be at the lower end, and guarded with a 

 movable grating. The escape-pipe should be of ample size, and 

 trapped at some point which can be reached. 



Excepting just over the escape, the sink should be covered 

 by one or more wooden lids on hinges which may be raised from 

 the front and rested against the waU behind the sink. These 

 lids should be of hard wood, and weU oUed or painted. In 

 each lid should be cut an oval or elliptical hole for a basin. 

 The longer diameter of the hole should correspond with that of 

 the sink, so that the basin may be emptied without lifting it from 

 its place. 



If there is no general water supply, a water cask or lead lined 

 box may be placed above the sink. In any case, the faucets should 

 be nearly on a level vdth the face of one standing at the sink, and 

 the water should be conducted therefrom through flexible rubber 

 tubes ending a little above the basin. The tube must be firmly 

 secured to the faucet, and must not be shai-ply bent if the pressure 

 of water is considerable. 



