S44 1 IMPROVED SCARIFICATOR. 



those sides upwards ; the sectors are prevented from mov- 

 ing, except when required, by a catch g, which enters 

 notches cut in the handle of the sector A ; this catch is a 

 brass bar, lying across the bottom of the box, as shown in 

 figs. 4 and 6, it moves on a screw as a centre pin at one end, 

 and is pressed towards the sector by a slight spring (not 

 seen) ; when it is to be discharged, a button h is pressed in, 

 which disengages the catch g from the notches in the piece 

 A, and permits the springs to turn the sectors about, and 

 hy their teeth acting in the pinions, turn the lancets round 

 at the same time, which is effected by the teeth of the two 

 sectors engaging each other, in order that they may not 

 operate so as to move the whole instrument upon the skin, 

 as is the case in the common scarificator. 



Fig. 5 shows, that the handle of the sector A has two 

 notches in it, for the catch g: when it is caught upon the 

 first of these, the instrument is in the position of fig. 4, 

 which is the half-cock, the lancets standing directly upright 

 out of the box ; in this position, the depth they are intended 

 to penetrate is adjusted by means of a screw /c, passing 

 through the bottom of the box ; it is tapped into a piece of 

 brass I, which is screwed to the lid m of the box ; the piece 

 of brass is bent, as shown in fig. 6, that it may clear the 

 lancets and their spindles ; when the screw is turned, it is 

 evident that it will raise or lower the lid of the box, and 

 cause the lancets to protrude more or less through it, and 

 consequently enfer a greater or less depth into the skin. 



When the instrument is to be used, the handle of the 

 sector A is to be drawn back into the position of Jig. 5, 

 which is at the full cock; the lancets are now turned dewn 

 wholly within the box, and the springs wound up ; the lid 

 is then to be applied fiat upon the raised-up skin of the part 

 to be scarified ; and by pushing in the button A, the catch g 

 is moved round on its centre pin, and pushed out of the 

 notches in the handle of the sector A ; the springs now turn 

 the sectors, and the lancets fly out of the box with incon- 

 ceivable rapidity; and making as many punctures in the 

 skin, return into the box, having made exactly half a turn 

 with their respective arbors. The dimensions of the instru- 

 ment may be ascertained by the scale of inches annexed to 

 the drawing, 



VI. On 



