‘ SANITARY PRIVY. 19 
automatically closing lid; second, by the water; third, by the . 
film of oil; and, fourth, by having the apparatus located in a 
screened place, which should be done for additional safety. ‘Ihe 
film of oil also prevents the breeding of mosquitoes in the barrel. 
Accordingly, so far as the privy as a breeding or feeding place 
of flies and mosquitoes is concerned, the model in question com- 
pletely solves the problem. 
The fecal material becomes 
fermented in the water and 
gradually liquefies; as the 
excreta settle, the level of 
the liquid is raised and the 
excess flows into the effluent 
tank, where it is protected 
from insects by the cover 
and by a film of oil. This 
effluent may be allowed to 
collect in the tank until it 
reaches the level of the con- 
necting pipe, when it may be 
safely disposed of in various 
ways to be discussed later. _ 
It is thus seen that this 
device appears to meet the 
following requirements: 
(1) It solves the fly prob- 
lem and the mosquito prob- 
lem, so far as the privy is 
concerned. 
(2) It liquefies fecal ma- 
terial and reduces its vol- 
ume, so that it may be safely 
disposed of more easily and 
cheaply than the night soil 
from other types of privies. 
(3) It reduces odor. 
(4) It reduces the labor of cleaning the privy and makes this 
work less disagreeable. 
(5) It is of simple and inexpensive construction. 
This device has been in constant operation in one of the work- 
rooms on the main floor of the Hygienic Laboratory at Washington 
for 8 months and has been found entirely satisfactory. From 
July 12, 1910, to April 1, 1911, namely, 262 days, it has been used 
738 times, giving an average of 24 defecations. (with urination) per 
463 
\ CGN Rian \\ \ x aE \ 
Se \ nN NEN w VK KAD 
nae Cee ae 
WENN NEN \ : Nine 
\ 
\ 
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Fic. 5.—Rear view of L. R. 8S. privy. 
