IGl 



Some New Forms or I'iiysiolocucal Apparatus, 



By J. F. WooLSEY. 



All l)ranches of scientific work require special apparatus to fulfill 

 their particular needs. The apparatus here shown was devised to meet 

 certain requirements for adjustable apparatus, for use with the Icymo- 

 graph, in recording physiological experiments. It is apparently desirable 

 in tliis work to have as many adjustments to the apparatus as possible, 

 tlu' solidity of the apparatus being unimpaired. 



ADJUSTABLE STAND. 



This stand consists of a base 5i{,"xS"xl": a standard IS" high and 

 1" in diameter, to whicli is attaclied. by means of arms, the swinging 

 rod upon which is supported, by means of universal clamps, the va- 

 rious forms of apparatus used in making the records upon the smolvod 

 drum of the kymograph. The entire stand weiglis 15 pomids. 



Tlie swinging portion of tlie apparatus deserves special notice. Fig- 

 ure 2 of the mechanical parts serves as the top arm, and the upper plate 

 of the lower arm. It is 3Vu'" long and 1%" wide at the broadest part. 

 Figure 1 is the lower plate of the lower arm, and is proportional in size 

 to the upper plate. Figures o and 4 show the entire mechanism. In 

 Figure 3, (a) is the coarse adjustment, and l)y releasing the set-screw tlae 

 swinging rod (d) can be revolved about the standard (o: the desired pres- 

 sure of the stylus against the drum of the kymograpli is obtained by the 

 manipulation of the more tinel.v-tlireaded screw (1j). In Figure 4. (b) rep- 

 resents rile tine atl justing screAv, and (I) tlic strong roiled spring, which 

 operates the swinging rod attaclied to (gi, as sliown in Figure 3. The 

 swinging rod is 14" long. 



The T'^nl versify of Pennsylvania uses adjustal)le stands, devised and 

 made liy themselves, but the entire movement of the swinging rod is 

 obtained from the l)ottom, and the mechanism is entirely different from 



11-A. OK S(MKNCK, '03. 



