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KOYAL SOCIETY OF CANADA 



W all the water })a.-~siiig through station "a'* had to be changed 

 from the solid to the liquid state — without any rise in temperature — this 

 o])eration would lequire the total output of 1000 stations as large as '' a." 

 This last amount of energy is represented by cube " c.'' 



These facts are also illustrated by the squares in Fig. 10. 



For explanation of Fig. 10 see note following Fig. 9. 



Fig. 11 illustrates a new method of dealing with the frazil question. 

 Fig. 11 is a picture of a frazil -combatting scheme which has given more 



Fig. 10 



beneficial results tliau one not personally conversant with the details of 

 its successful operation can readily imagine. First of all, the action of 

 cold air is carefully excluded from every part of the plant. This, in my 

 opinion, is a point of vital importance and one that should receive care- 

 ful attention. Secondly, heat is applied to the parts of the plant to 

 which frazil is likely to adhere, i.e., at the rack, and at the controlling 

 gate. This (Fig. 11) is a picture of an installation at Ottawa. 'JTiis 

 rack never blocked up with frazil while it was thus equipped. This 

 wheel has not choked up with frazil and this gate has never been uncon- 



