168 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
Physical Properties of Morris and Blunter Brick Company Upper Sandy Clay 
(Lab. No. 0 - 23 ). 
Excellent. 
Plasticity, judged by feel.... 
Water of plasticity. 
Pore water. 
Shrinkage water. 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Overfires at cone 9. 
24.95% 
0.57% 
24.38% 
12.7 % 
31.1 % 
345.4 pounds per square inch. 
5 minutes. 
Fire tests: 
T emperature. 
Linear Shr. 
Per Cent. 
A bsorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
950°C. 
0.7 
11.82 
23.95 
Buff. 
1050 
0.3 
12.38 
26.75 
Buff. 
1150 
0.3 
11.68 
26.45 
Buff. 
1190 
0.3 
11.40 
25.50 
Buff. 
1230 
0.5 
11.40 
26.45 
Buff. 
1310 
2.3 
11.80 
21.IS 
Buff. 
The lower light-colored clay has the following physical properties: 
Physical Properties of Morris and Blumer Brick Company Lower White Clay 
(Lab. No. 0 - 24 ). 
Plasticity, judged by feel. Excellent. 
Water of plasticity. 36.40% 
Pore water. 0.88% 
Shrinkage water. 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Steel hard at cone 010. 
35.52% 
8.90% 
22.05% 
114.0 pounds per square inch. 
3 minutes. 
Fire tests: 
perature. 
Linear Shr. 
Absorption. 
Porosity. 
Color. 
Per Cent. 
Per Cent. 
Per Cent. 
950°C. 
11.4 
4.58 
12.15 
Salmon. 
1050 
13.6. 
4.50 
10.45 
Gray. 
1150 
13.6 
Gray. 
1190 
13.1 
3.53 
8.95 
Gray. 
1290 
13.1 
2.58 
6.65 
Gray. 
1310 
12.1 
1370 
16.1 
A similar clay is exposed a few rods south of the Tampa 
Northern station. It may likewise be used for a common brick, but it 
also requires very careful drying and burning to avoid excessive crack¬ 
ing. Its physical properties are: 
