146 FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT


 Physical Properties of Gull Point Clay No. i (Lab. No. o-49).
 Plasticity, judged by feel............ Excellent.
 W ater of plasticity ................ 22.95%
 Pore water ........................ 0.15%
 Shrinkage water ................... .22.80%
 -Linear air shrinkage................ 7.3%
 Volume air shrinkage............... 22.9%
 Modulus of rupture, average........ 246.2 pounds per square inch.
 Slaking test ....................... 24 hours.
 Steel hard at cone 05.
 Overfires at cone 16.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950'C. 6.7 18.58 35.75 Pink.
 1050 7.3 17.90 34.40 Pink.
 1150 7.0 12.38 28.00 Cream.
 1190 7.2 12.25 23.60 Cream.
 1230 7.1 12.54 23.00 Cream.
 1310 7.4 9.41 22.20 Gray.
 1370 8.2 6.49 21.30 Gray.
 1430 8.2 2.85 13.00 Gray.

 Gull Point Clay No. 2, the second clay stratum from the top of the section, has the following physical properties:

 Physical Properties of Gull Point Clay No. 2 (Lab. No. 0-2).
 Plasticity, judged by feel............ Excellent.
 W ater of plasticity ................ 31.75%
 Pore water ........................ 0.93%
 Shrinkage water ................... 30.82%
 Linear air shrinkage................ 8.3%
 Volume air shrinkage............... 28.9%
 Modulus of rupture, average........ 180.7 pounds per square inch.
 Slaking test ....................... 1 hour.
 Steel hard at cone 1.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950'C. 0.8 27.87 39.17 Pink.
 1050 0.8 20.79 37.50 Pink.
 1150 5.7 10.45 23.26 Gray.
 1190 6.7 5.20 12.30 Gray.
 1230 6.7 5.08 10.50 Gray.
 1310 6.7 4.82 10.45 Gray.
 1370 6.7 1.92 7.53 Gray.
 1430 8.2 1.36 7.16 Gray.

 Gull Point Clay No. 3 lies nearest the bottom of the section. It has a deep, reddish-pink color in its raw state, which it retains when fired at cone 05 but loses before cone 1 is reached. It has the following physical properties: