EEPOET OP THE ENTOMOLOGIST. >/ , , yl37 



:;^Mj 



the tool more easily wielded than if the might- were more distaut>#em 

 the hand. The form of the can is found to be preferably that of a 

 double cone or double pyramid. At its top is a can- screw opening for 

 inserting the powder and closing it securely from wetness. The blast 

 spout passes radially against the inside of the basal cone. The internal 

 relations of the blast to the powder will be better explained by observing 

 Fig. 2, which is a sectional view longitudinally through the parts. The 

 tube, e r, inside the can, has a slot in its side, or sides, and about midway 

 in its passage is a shut-off device, j, where this is set, partially closing 

 the tubular passage; only a part of the blast going through direct, while 

 the rest is crowded out to grind away the powder exposed by the slot 

 passage. The more of the blast thus crowded out, the more of the 

 powder will be fed to, and carried away by, the blast. One, two, or 

 more slots or rows of holes of size and shape to suit may be thus made 

 whereby the blast can act upon the powder in the base of the can. 



Other views of the same device, with an extension pipe, having a 

 crooked discharge end, appear in Figs. 4 and 5. The lettering has the 

 foregoing explanation so far as it corresponds ; but j indicates the upper 

 or movable face of the bellows, a gauze cover over its incurrent valve, 

 i is the long extension pipe, with a crook, and s its discharge. The long 

 pipe enables the poison to be freed at a safe distance from the operator, 

 and the crook allows it to be easily applied either in an upward or a hor- 

 izontal direction into the plant. 



Other crooks desirable for some purposes are shown in the extension 

 pipe as seen in Fig. 3. These blowers work with little effort and do 

 very satisfactory work. 



A tool very similar in shape, but for blowing liquid spray, is repre- 

 sented in Figs. 6 and 7. The bellows is the same as that explained above. 

 The blast pipe, /i, , r, i, s, is connected with a separate part of the res- 

 ervoir, p, for the poisoned liquid, and a can screw-cap, ?/, is found con- 

 venient for this purpose. When the receptacle is removed by unscrewing 

 it, the small feed-tube, x'y. and the^blast-pressure orifices, by whicbithe 

 blast-pressure in the tube is communicated into the Teservoir and ypon 

 the liquid therein, except that which is in the feed-tube and to be 

 ejected by said pressure, to squirt liquid through the feed-pipe into 

 the blast-pipe, are exposed to be of easy access in case of choking of 

 the passages, or if it is desired to readjust their alterable capacity to 

 feed a greater or less quantity of liquid to the blast. The peculiar form 

 of the poison-can, p, with the feed-tube terminating in its basal apex 

 permits a greater range of tilting of the same without interfering with 

 the supply to the feed-tube, even if the liquid is low. But the construc- 

 tion is such that the apparatus feeds when inverted or when in any 

 other position, and in all positions the feeding is by virtue of the blast- 

 pressure, through an inlet from one part of the blast-pipe where the 

 pressure is greatest to the interior of the receptacle and upon the liquid 

 therein, to eject it into another part of the blast-pipe where the pressure 

 is less. 



The small can is at times furnished with an automatic supply of 

 liquid from a larger tight reservoir, carried knapsack-fashion upon the 

 back or otherwise, and having an excurrent tube conected with the 

 inlet, 7, of the smaller receptacle. Such a larger receptacle is repre- 

 sented upon the back of a person in Plate V, Fig. 1. An extension 

 tube, ij is shown, and this may terminate in a reatomizing nozzle similar 

 to the nozzles represented in Figs. 2 and 3, or the simpler form here 

 figured which is made by closing the end of the tube and making a 

 side perforation, s, at a short distance back from the end wall. By 



side pei 



