PARKS 



able for use in handling much larger quantities of excreta than the type 

 previously described. This incinerator should be constructed under expert 

 supervision. Where incinerators of any kind are installed for constant use 

 over a considerable period of time a battery of two or more should be built 

 in order that one may be placed out of service for repairs. 



The septic tank installation can be used for the disposal of the excreta 

 from a sanitary privy, provided that a corresponding amount of water, 

 fifteen to twenty gallons per person per day, is introduced into the tank 

 with the excreta. The excreta must be placed in the tank at such intervals 

 as will not cause overloading. This plan is particularly feasible where some 

 of the camp sites or picnic places are equipped with flush toilet and septic 

 tank disposal systems and the remainder with sanitary privies. 



Whatever method is used to dispose of the contents of the sanitary 

 privy, the privy pails must be handled with care and precautions taken to 

 prevent the spilling of the contents in the privy boxes or on the ground. 

 Hand-propelled carts or a small motor truck may be used to transport the 

 pails to the place of ultimate disposal. The pails should be removed at 

 night, or at such other times as will produce the least offense. When emp- 

 tied, the can is thoroughly cleansed with water, either from a hose under 

 pressure or by swabbing and rinsing. The bottom of the cleaned pail should 

 be covered with about one-half to one inch of a five per cent solution of 

 cresol which will serve as a deodorant as well as a disinfectant. 



The L. R. S. privy. The septic tank principle of sewage treatment is 

 utilized in the operation of a L. R. S. privy. For parks and reservations 



where flush toilets cannot be 

 used the L. R. S. privy, or one 

 of its modifications, provides the 

 best means of disposing of human 

 excreta. The essential feature 

 of a L. R. S. privy is a small 

 septic tank having two compart- 

 ments, the liquefying tank and 

 the effluent tank (Plate 322). 

 The liquefying tank is directly 

 under the privy box. The ex- 

 creta is retained for a time in 

 the liquefying tank where it un- 

 dergoes decomposition and lique- 

 faction with some reduction in 

 volume. From the liquefying tank the liquid passes through a screened pipe 

 into the second compartment known as the effluent tank. From the latter 



PLATE No. 322 

 L.R.S. PRIVY WITH CONCRETE TANKS 



(Public Health Bulletin No. 68, Lumsden, Stiles & Freeman.) 



