HOME-MADE TANK. 63 



which -should be carried to the highest convenient point 

 well away from any window or chimney top. Through 

 one side of the barrel, close to the top, make a hole large 

 enough to receive a I 1 | a inch lead pipe, which, being turn- 

 ed down to within 6 inches of the bottom inside, and 2 

 or 3 inches lower at the outside, is to constitute the siphon 

 for emptying the barrel this pipe should not be larger 

 than r| a inches interior diameter, as the larger the pipe 

 the greater the amount of water needed to start it into 

 action. The outer end of this pipe delivering into the 

 drain is partially shielded from the access of air by an ar- 

 rangement which will be described further on. 



' ( Fig. 26 shows the arrangement of the whole apparatus. 

 A is the barrel, b is the metal rim, or gutter surrounding 

 the opening ; c is the funnel with 

 its trapped outlet ; d is the iron 

 grate ; e is the siphon ; / is the 

 outlet drain ; g is the ventilator ; 

 and h is a simple cylinder of gal- 

 vanized iron or tin, to be used 

 when the top of the barrel is above 

 Fig. 27.-FUKNEL. groiin d, go that it may be well 



packed around with leaves or litter without danger of 

 these getting in to choke the grate. Where such packing 

 is necessary, the whole affair should be housed in to pro- 

 tect it from the wind, and indeed it is always necessary 

 to prevent the blowing in of rubbish which might plaster 

 itself over the grate and prevent the water from entering. 

 "Fig. 27 shows more in detail the construction of the 

 rim, the funnel, and the grate. The gutter of the rim 

 will be always kept full of water from the small amount 

 splashing over, and this serves to seal the channel at this 

 point just as the bent pipe at the bottom of the funnel 

 seals its outlet. These seals are not liable to be forced, 

 because of the ample air channel furnished by the ven- 

 tilator. 



