Gjreenhocse Notes. 165 



Continuing from here, run C extends 4 ft. south, 4 ft. east into cool 

 pit, 3 ft. south, 4| ft. west into house again, 6^ ft. south to southeast 

 corner of house, 26 ft. 3 in, west to southwest corner, 6 in. north 

 obliquely downward, where it is enlarged to a 2-in. pipe and continues 



1 ft. 3 in. further in the same direction, 2 ft. 4 in. west, 1 ft. south, 10 

 in. west to boiler. 



Riser B extends 6 ft. 8 in. east, 2 ft. 8 in. north obliquely upward, 

 21 ft. east to within 3 ft. of opposite end. An extra crook was put in 

 this riser Januarj'- 31, giving measurements 4 ft. 5 in. east, 2 ft. 3 in. 

 north, 3 ft. 3 in. east, 2 ft. 3 in. south, 13 ft. 2 in. east in place of the 

 21 ft. straight east. This crook or offset was made for the purpose of 

 testing the effect of angles or " corners " in the flow of hot water and 

 steam (page 170). Return falls 9 ft. 8 in. south obliquely downward, 

 23 ft. 2 in. west to southwest corner, 4 ft. north obliquely downward, 



2 in. down to the 2-in. pipe of C, entering it 3 ft. 4 in. from where the 

 2-in . pipe begins. The drawing does not show this last connection 

 just where it should be. 



Riser A extends straight east 28 ft., entering riser B 5 ft. 10 in, from 

 the bend at the southeast corner of house. 



The long run added March 14th, extended 2 ft.' 8 in. vertically 

 upward, 9 ft. 9 in. northwest, 72 ft. west to west end of a radish house, 

 rising gradually the whole distance, 6-j in. vertically downward, 79 ft. 

 east with gradual fall to east side of work room, 6 ft. south, 4 ft. 6 in. 

 down vertically, 4 in. south to main return 6 in . from boiler. 



All the runs are 1^ in. pipe except the last of the general return 

 as indicated in the description of series C. 



The three risers passing into the test house were about 3 f t . 3 in . 

 above the general water level of the boiler as kept for steam. This 

 fall was so slight that this water level cut the oblique 2-in. return 

 about at the tO]) of the T., where the return from risers A and B 

 entered it, thus leaving a 2-in, column of water extending out about 

 8 ft. from the boiler, part of this distance being horizontal and part 

 oblique. 



All thermometers in this test were inserted in the pipes, being packed 

 with rubber in nipples of ^-inch pipe which were in turn screwed into 

 the heating pipes. They were located as follows: — No. 1 in the 

 4-inch pipe, which served as a steam dome' for the boiler; No, 2 in the 

 left riser (C) at the upper northeast corner of the house; No, 3, in this 

 same run inside the cool-pit just before the pipe re-enters the house; 

 No, 4 in the middle riser, B, close to the end farthest from the boiler; 

 No, 5, in the same way at the end of the right riser (A); No. 6 in the 



