FlG. 16. Arrangement of pipes at the end of a rose house. On the 

 right and left, one and one-quarter inch coils are reduced to three- 

 quarter inch. In these are placed the valves which control the heat. 

 In the lower foreground is a Squires trap, and the upright pipe from 

 this carries the water from the condensed steam back to the boilers. 

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