118 THE GRANITES OF MAINE. 
stone from the Stinchfield and Longfellow quarries, but in very 
minute quantity. 
A test of the crushing strength of this granite made by Ricketts 
and Banks yielded the following results: 
Pounds per 
square inch. 
First cube . : 19, 260 
Second cube 15, T.'iO 
Average 17. 195 
The difference in the two cubes is attributed to some imperfection 
in the second one. 
The quarries were opened about 1826. The Stinchfield quarry 
measures 600 feet from northeast to southwest by LOO across and 
from 30 to 60 in depth. (See PI. IV. B.) The Longfellow quarry 
(not in operation, hut filled up to '20 feet with water), southwest of 
Fig. 
Structure ni Stinchfield and Longfellow quarries, near Hallowell. 
the above and communicating with it. measures about 100 by 200 
feet and from 50 to 70 feet in depth. The drainage of the Stinch- 
field quarry requires pumping for a few hours after heavy rains, 
and that drainage supplies the boilers. The stripping consists of 
from 1 to 20 feet (increasing northwestward) of yellowish sandy 
clay with small bowlders near the top. (See PI. IV, B.) 
Rock structure: The most striking features in these quarries are 
the gradual increase in the thickness of the sheets downward ( partly 
shown in PL IV, B) , which ranges from 4 inches to 14 feet, and the 
evidence of strain afforded by the numerous headings and joint 
systems shown in fig. 20; also the evidence of weathering afforded 
by the decomposition and discoloration along these headings. The 
sheets range from a horizontal position to an inclined one of 15° 
NE. Many of them stop at the joints, probably owing to faulting: 
