161 



Some New Forms of Piiysiolocical Apparatus. 



By .1. F. WooLSEV. 



All Itrauches of scieiiTitic work rtMiuire special apparatus to fiiltill 

 tlu'ir inirticular iiocds. The apparatus liei'e shown was devised to meet 

 certain i'e(jnirenients for adjustable apparatus, for use with the kymo- 

 .yraph, in recording physiological exi:eriiuents. It is apparently desirable 

 in this work to have as many adjustments to the apparatus as possilde, 

 the solidity of the apparatus liein.i;- unimpaired. 



ad.ti'stablp: stand. 



This stand consists of a base .■')i._."x.S"xl": a standard 18" high and 

 1" in diameter, to which is attached, by means of arms, the swinging 

 rod upon Avliich is supported, by means of imiversal clamiis. the va- 

 riotis forms of apparatus used in niakini;- the records upon tlie smoked 

 drum of the kymot;raph. The entire stand weighs 1.5 pounds. 



The syringing portion of the apparatus deserves special notice. Fig- 

 tne 2 of the mechanical parts serves as the top arm. and the upper plate 

 of the lower arm. It is :U-_." long and 1%" wide at the broadest part. 

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

 to the upper plate. Figtires M and 4 show the entire mechanism. In 

 Figure ."!. (a) is the coarse adjustment, and by releasing the set-screw the 

 swinging rod (d) can lie revolved aliout the standard (o: the desired pres- 

 sure of the stylus against the drum of the kymograph is obtained l)y the 

 luanipulation of tlie more tinely-thrcaded screw (b). In Figure 4. (b) rei> 

 resents the tine adjusting scrcAv. and (f) the strong coiled spring, which 

 operates the swinging rod attached to (gi. as shown in Figure o. The 

 swinging rod is 14" long. 



The Uiuversity of Pennsylvania uses adjustal)le stands, devised and 

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

 obtained from the liottom, and the mechanism is entirely dift'erent from 

 II— A. OF Science, '03. 



