170 
ELEMENTARY CHEMICAL MICROSCOPY 
hard, the blades are moderately flexible and the teeth sharp 
The wide blades have usually about 20 teeth to the inch and the 
narrow blades about 28 teeth to the inch. A tool of this sort 
is of constant use in industrial microscopy. 
A tiny tool-makers’ vise and tiny steel clamps are necessary 
adjuncts to the Greenough type binocular microscope. They 
are employed to hold a specimen firmly, from which particles 
are pricked out with needles or chiseled out with tiny cold chisels 
^hd a tiny hammer. The “ set up ” for work of this nature is 
shown in Fig. 30. The removal of particles for subsequent 
analysis is more conveniently done under the binocular micro¬ 
scope than under a simple magnifier. 
The loosening of particles from other material in which these 
particles are imbedded may often be accomplished by dissect¬ 
ing instruments; the most useful of those of small size are illus¬ 
trated in Figs. 108, 109 and no. The chemist will find instru- 
Fig. 108. Spear Point Dissecting Needle of “ Stellite.” Xf. 
ments made of “ stellite ” ^ superior to those of steel. This alloy 
is harder than steel, stainless, rustless and resists the attack 
Fig. 109. Knife Needle of “ Stellite.” Xf. 
i 
of most chemicals with which the instruments come in contact. 
The author has found them to hold an edge well and to be easily 
Fig. 110. “ Eye Spud ” of “ Stellite ” converted into a narrow chisel. X| 
sharpened and kept in good condition; their superiority over 
steel in the chemical laboratory is very great indeed. 
1 “ Stellite ” is an alloy of cobalt, chromium and tungsten with a little iron, 
nickel, manganese, carbon and silicon. Dissecting instruments made from this 
alloy may be obtained from the Haynes Stellite Co., Kokomo, Ind. 
