s 



— 22 — 



top extends back a short distance so as to allow a small tack {w) 

 to fasten it to e- at o. The top of the other support (e^) is cut ta 

 fit closely about the tank. The broken lines m-n and r-p-w in- 

 dicate the position of hand-rests (x), which are tacked to the 

 oblique portions of the supports, and cut to fit about tank. The 

 line -w-q is slightly slanted to facilitate the escape of any bubbles 

 generated in xh. On r a flame shield {d), with a small vent at top, 

 is fastened. The supports {e) can be lengthened or shortened at 

 bottom if the flame does not occupy about the relative position 

 indicated in fig. A. The lamp should be (preferably) one with 

 a rack adjustment for wick, and the wick about % of an inch in 

 diameter. 



A % steel rod (/) is bent near top and a flat place filed at end 

 and a small circular plate (s) soldered thereto. To the under 

 right hand side of this a thin, flat brass spring (g) is riveted or 

 soldered. By this arrangement any hand lens can be held in 

 position for examination of sections on slide beneath it, as shown 

 in fig. A (t). A thin white paper under the slide will help to 

 better distinguish objects. The focus of lens is adjusted by 

 sliding the rod /between the four round-headed screws (i) which 

 guide it, and the brass wire spring (u) which holds it firmly in 

 place. The spring u should be less than twice the thickness 

 figured, and firmly fastened with four staples {v). 



