CHAPTER VI 
BELL AND HOOP TENTS 
HE tents known as bell tents are cylindrical in 
shape, with the top rounded over like a dome. 
EMA] «They are used in connection with a derrick, 
by means of which they are placed upon and 
lifted from trees; the derrick also supports the weight of 
the tent while it is upon thetree. The bell tent was one 
of the original forms of tents, and while mostly sup- 
planted by other styles, is- still used to a considerable 
extent, especially for very large trees. It is the only 
form of tent now in use where the whole weight of the 
tent is not carried by the tree, and many favor it for 
this reason.* 
The derrick used with the bell tents at the present 
time is that used with the Preble fumigator, or some 
modification of it. This isshown in Fig. 13. It con- 
sists of a wagon, which supports a mast considerably 
higher than the trees to be fumigated, and is braced at 
the bottom with stays that hold it rigidly in place. 
Across the top of the mast a yard is fastened and 
braced with trusses extending from the mast. The 
length of the yard is about a third longer than the 
distance between the rows of trees. Near each end of 
* This description is taken from the excellent bulletin 
(No. 122) by Prof. C. W. Woodworth, of the California 
Experiment Station. 
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