No. 4.] GYPSY MOTH APPENDIX. 471 



socket (o), into which the long, cup-shaped receptacles (Plate X, 

 Figs. 'J and 10) are inserted. These are designed one to contain 

 arsenate of soda and the other acetate of lead. The slits ou 

 either side of these mixers are covered with a fine brass wire 

 screen, and. as the mixers move up and down with the agitators, 

 the chemicals are dissolved and work out through the wire screens 

 into the liquid. The pump can be used in any tank or barrel, for 

 it can be attached to the bottom of the tank by iron buttons, 

 which are not shown in the cut. 



Hose and Couplings. 



The hose now in use is the smallest and lightest that has ever 

 been made for spraying. Soon after work on the gypsy moth 

 was begun, in 1891, Prof. C. V. Riley recommended the use of 

 quarter-inch hose, but none could then be obtained. Rubber 

 tubing had not sufficient strength. The hose now used is oue- 

 fourth-inch woven cotton hose, liued with rubber and made 

 especially for this work. Although small and light, it is strong 

 and durable and answers every purpose. Before the hose could 

 be used in the field it was necessary to invent a coupling which 

 would not reduce the size of the aperture. The coupling invented 

 for this purpose is illustrated on Plate X, Figs. 6, 7 aud 8. Fig. 

 (1 shows the coupling attached to the hose and screwed together. 

 The parts are lettered to correspond with those shown in Figs. 7 

 and 8. The manner in which the hose is inserted into the coupling 

 may be readily understood by a glauce at Fig. 8. The piece j is 

 slipped on the outside of the hose and pushed back an inch from 

 the end; the piece 7, which is a tapering- cylinder with a quarter- 

 inch hole, is then put into the end of the hose and driven down ; 

 the piece / is passed over the opposite end of the hose, which is 

 to be coupled, and a piece similar to I is driven in there. The 

 two pieces/and j are then drawn forward, as far as possible toward 

 the ends of the hose, and the threads in pieces g aud i are con- 

 nected with the threads of / and j and screwed down tightly. 

 Fig. 7 shows the construction of a swivel joint, which connects 

 the hose tightly together without the necessity of turning either 

 piece of hose in coupling. This does away with the use of the 

 washer or gasket which is used with the ordinary coupling, and 

 which is often lost, causing a leakage. The pieces h and k, fast- 

 ened together as they are by the screw, form a movable piece, 

 which can be turned to the right or left, the thread in 7,' enter- 

 ing the thread in gr, drawing the coupling aud hose together, as 

 shown in Fio-. 6. 



