Page 406 - Moving the Earth_ The Workbook of Excavation
P. 406
BLASTING AND TUNNELING
9.6 THE WORK
FIGURE 9.5 Track and blast hole drills.
materials, because of waste space around cartridges. The amount of difference will depend on the
efficiency of tamping.
To find the amount of dynamite with a rated density of 164 sticks to the 50-pound case that
can be tamped into this hole, follow the horizontal line in the table from the 3-inch line to the right
to the fourth column, under the values 47 and 164. We find that a 3-inch borehole will hold 2.3
pounds of this powder per lineal foot. Multiplying this by the 9-foot length, we have a possible
load of 20.7 pounds.
