PHYSICAL PEOPERTIES 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 1^-pound 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. 
