PHYSICAL PROPERTIES OF ROAD-BUILDING ROCK. 27 



100 burlap bags about 17 inches square. 



500 blank tags. 



1 50-pound anvil, 



1 10-pound sledge. 



1 3-pound double-face stone hammer. 



1 Impound single-face stone hammer. 



1 6-inch scoop. 



1 barrel quartz sand between No. 30 and No. 40 sieves. 



1 50-pound bale of waste. 



1 waste can. 



1 oil can and motor oil. 



This equipment should be sufficient to enable a force of three men 

 to maintain an average of 24 routine rock analyses per week. The 

 complete cost of equipping a laboratory as outlined above should 

 not exceed $1,500 and would probably not reach this figure if some 

 of the larger machines were shaft driven instead of direct connected. 



