APPENDICES. 143 



A short distance above this clainp is an arm or boom and its triangular 

 brace, bolted together so as to encompass the mast ; at either end of 

 this arm is a frame carrying one main roller and two side rollers, the 

 latter being placed at a distance of about 6 inches from either end of the 

 main roller, and their office is to prevent the tent from passing off of the 

 ends of the main roller while it is being drawn over the latter. For the 

 support of these rollers and the triangular brace, iron rods are attached 

 to the top of the mast and pass to either end of each of the roller frames, 

 and also to each outer corner of the triangular brace, while two other 

 iron rods are fastened at one end to each outer corner of this brace, their 

 other ends being fastened to one of the wooden side-pieces of the frame 

 on the waggon. An iron rod also passes from each outer corner of the 

 triangular brace to either end of the roller frame at the outer end of the 

 arm to prevent side motion. 



The tent is drawn off of the tree by means of a rope that passes through 

 the two main rollers and down the mast to a windlass attached to the 

 frame of the waggon, extending from one side piece to the other, and 

 passing just behind the mast ; Jry turning this windlass the tent is drawn 

 off of the tree, passing over the main roller at the outer end of the arm, 

 then over the one at the opposite end, and down the mast till the bottom 

 of the tent has been elevated above the tops of the highest branches of 

 the tree. At the bottom of the tent is fastened a circle of gas-pipe, for 

 the purpose of keeping the bottom of the tent spread out while it is 

 passing down over the tree ; iron or steel rods made into a circle would 

 be preferable to the gas-pipe, which is liable to break at the joints or 

 couplings. To this circle are attached two or three ropes, to be used in 

 pulling the tent down over the tree. The main rollers at either end of 

 the arm are provided with a deeply-grooved pulley in the centre of each, 

 over which the rope passes in drawing the tent off of the tree, or allowing 

 it to pass down over one. 



When it is desired to transport this fumigator to a considerable dis- 

 tance the mast is lowered by means of a derrick composed of four pieces 

 of pine timber ; the lower ends of the foremost pieces are attached to 

 the front corners of the frame on the waggon, while the ends of the 

 other two pieces simply rest upon that frame on either side of the mast. 

 The upper ends of these pieces are fastened together by a strong iron 

 bolt to which a large pulley is attached. In lowering the mast a large 

 rope is attached to it just above the point where the iron clamp encircles 

 it ; the other end of the rope is then passed through the pulley at the 

 upper end of the derrick, and from this point it passes to the windlass, 

 upon which the rope is then wound. The block of wood bolted to the 

 waggon-reach in front of the mast is then removed, and the stay-rods 

 fastened to the frame on the waggon are disconnected ; then, by un- 

 winding the windlass the mast is lowered until it rests horizontally upon 

 the waggon, turning upon the iron pin that passss through the mast near 

 its base. 



I have used this fumigator repeatedly, and it has given good satisfac- 

 tion when used on level ground and at a time when the wind was not 

 blowing very hard. Two men can operate it with ease. For transporting 



