100 



THE HON. SIR CHARLES ALGERNON PARSONS : EXPERIMENTS ON 



(B.) RIFLE EXPERIMENTS. 



(See figs. 6, 7, and 8.) 



EXPERIMENT. 



RESULT. 



0-303 bullets were fired into holes, - 303-inch diameter (in some cases 

 of tungsten steel air hardened, tapering to |-inch at the bottom) in 

 steel blocks ; in the holes were placed the following substances : 



Coarse carborundum; No. 6 grit, which after the experiment was Nil. 



found to be crushed to small splinters. 



Carborundum (very fine grained) and sodium ; carborundum unaltered Nil. 



Carborundum and iron ; very fine grained carborundum atid finely Nil. 



powdered iron, the carborundum appeared slightly whitened, other- 

 wise unaltered. 



Calcium carbide and sulphur ; calcium carbide all destroyed and Nil. 



calcium sulphide formed. 



Carborundum (very fine grained) and nickel filings; no whitening of Nil. 



the carborundum. 



Carborundum and sodium peroxide Sodium silicate and amor- 

 phous carbon formed. 



Bort ; somewhat crushed No change. 



Fired bullet through carbon arc into hole in steel block Nil. 



Fired bullet through carbon rods arcing in a bed of graphite contained Nil. 



in fire clay crucible, above the hole in steel block. 



Graphite and sodium peroxide Graphite destroyed. 



Fired bullet through white hot iron plate into hole containing carbon Nil. 



rod heated white hot by resistance heating. 

 Fired bullet into hole containing graphite in steel block whilst arcing Rounded fragments of 



between top of hole and a carbon rod to produce vapour of iron. graphite. 



Calcium carbide and paper (wet) ; amorphous carbon formed .... Nil. 



Cotton wool ; a little amorphous carbon formed Nil. 



Potassium chlorate and sugar carbon Nil. 



Carbon bisulphide and rubber Nil. 



Carbon bisulphide and sodium bismuthate Nil. 



Carbon bisulphide arid potassium chlorate Nil. 



Mineral oil Nil 



Carbon bisulphide Nil 



Sodium bismuthate, benzene, and carbon tetrachloride Nil. 



Graphite and paper ; bullet struck side of hole in block, producing a A few crystals. 



small amount of molten iron. 



Through white hot carbon-bridge over hole electrically heated to point A few crystals. 



of vaporization. 



Graphite and iron Nil 



Graphite and fulminate caps Nil 



White hot graphite, contained in small crucible previously heated in Nil. 



arc furnace and placed above hole. 



Red hot graphite as above Nil 



Graphite and fulminate in paper . . Nil 



