1886.] on the Principles of Domestic Fireplace Construction. 349 



Tlie diagram of the grate, with the square and triangle on which 

 it is based in dotted lines, will, I hope, make this description suf- 



Fio. 1. 



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ficiently intelligible. Whenever a grate on this principle proves too 

 hot for a room, and in summer when a smaller fire is needed, the size 



