36 KANSAS ACADEMY OF SCIENCE. 
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SERS ASS 
SER SS SAS 
Apparatus for Jesting Relative 
Heating Pawer of uluminating Gas and Cal. 
and the water taken out and weighed when boiling hot. A weighed amount of 
coal is put on the grate and quickly ignited, and its burning is accelerated by the 
use of a foot-blower attached to the two pipes coming to the outside of the appa- 
ratus, as previously mentioned. The products of combustion are carried up 
through the one-and-three-fourths-inch pipe, which, in their passage, heat the 
water. Of course there is considerable smoke, and this is carried off by a two- 
and-one-half-inch pipe which fits over the smaller one. When the coal is nearly 
consumed that which remains is raked out and weighed, the water is drawn off 
and weighed, and the calculation is made with reference to the coal consumed. 
While it is admitted that the apparatus is liable to some errors, yet it is de- 
vised with the object of imitating, as well as possible, the natural conditions 
which hold in the consumption of fuel undera boiler. The tests are compara- 
tive; and in neither case is all the heat utilized. 
