Tbmperatuee of Water. 83 



this purpose a boiler costing $25 will be found to be of 

 sufficient, capacity to temper 300 barrels of water. 



To temper a supply from city hydrants so that it 

 rfiall be even, is not so easy a matter, unless it be done 

 in a similar way. This would require a receptacle for 

 the water sufficiently strong to resist the pressure, but 

 will, I think, be more satisfactory than other methods 

 if a considerable quantity of water is needed. When- 

 ever the construction is such as has just been described, 

 after" the water has been brought to the required tem- 

 perature, shut off the pressure while using, depending 

 upon the elevation to give what is needed. In this 

 way all used will be of even temperature, while if you 

 draw out and allow the high hydrant pressure to fill 

 at the same time, there will necessarily be more or less 

 variation in the degree of warmth in the water used. 

 This is the objection, as it seems to me, to the plan 

 advocated by some, of having a hollow saddle back 

 boiler set over a row of pipes under a bench, filling it 

 with water, attaching the hydrant to one end and 

 drawing from the other, dependence being made upon 

 the pipes under it for tempering. Some depend upon 

 having a sufficient number of water pipes in the house 

 to temper the water used for syringing, but if much is 

 needed the supply soon becomes exhausted. 



I know of no better way for winter work than that 

 first described, whether the water supply be public or 

 private. 



