EXPERIMENT STATION REPORTS. 



123 



is required to make it feasible. We have, therefore, reached these con- 

 clusions concerning furnaces : 



1. Where the flame is passed below the material for cremation, the 

 grate burns out so rapidly that the method becomes impracticable. 



2. Where the flame is made to lap down from above by forced draft, 

 the cost of construction is excessive. 



When our present laboratory was built in 1902, a stack 40 feet high 

 was built with grates, a fire box, and an ash pit; in other words, the 

 furnace consisted of the lower portion of the stack or chimney. The 

 walls of the stack were of solid brick, the inner lining wall consisted 

 of the ordinary sand brick. The grates were the common furnace 

 grates. 



After three months of very moderate use, the grates had burned and 

 warped so they were of very little use. Finding that furnishing of 

 grates would Jbe so expensive, we resorted to one means or another 



1/ f. 



C oh 9j s^-t 



\Sca/^ Tot' OOOy/is ■ / = /fi ' 



CRE.MMTING- FU.RNACEl 



E)-^C-rE.RIOL-00-IC/=\l_ DE1F='T 

 MICHI&ANI «ORICUl_TURAU COUUtGE. 



to support the material and place the fire below. In the fall of 1900, 

 we had occasion to burn a large number of hogs, and, as is well known, 

 the burning of a hog produces intense heat. This resulted in the 

 cracking of the chimney or stack. 



A new chimney or stack was ordered, but in the construction of 

 this, the interior lining wall cfousisted of fire brick and an- air space 

 of two inches was introduced between the fire brick and the outside 

 layer of brick. By this construction, it was hoped that the possibility 

 of cracking would be eliminated. 



Before completing the work of burning the hogs, the janitor acci- 

 dentally used a couple of gas pipes to sustain the material in order to 

 place the fire below. It was found after considerable use, that these 

 gas pipes remained intact. It occurred to us at that time that per- 

 Imps tiie gas pipe would furnish a solution of the grate problem; ac- 



