ADMINISTRATIVE REPORT 
1 9 
water of plasticity, 27.4%; dries satisfactorily; linear drying shrinkage, 9.6%; 
linear burning shrinkage, at 990 degrees G, 0.05% ; at 1110 G, 0.82%; at 1230 
G, 2.34%; at 1320 C., 3.97%] red burning; per cent porosity, at 850 degrees G, 
28.1%; at 950 G, 26.8%; at 980 G, 25.7%; at 1010 C., 25.8%; at 1040 C., 
24.8%; at 1070 C., 24.6%; at 1100 C., 22.5% ; at 1130 G, 22.5%; at 1160 C., 
20.4% ; at 1190 C., 16.6% ; at 1220 C., 11.5% ; at 1250 C., 7.5%. A sandy surface 
clay of fair working and drying behavior. A decrease in porosity is noted with 
increase in temperature, although it is doubtful whether a vitrified product may 
be manufactured from this material, owing to the relatively high temperatures 
necessary. 
Sample No. 12, Clay County. Very plastic and possesses fair working qual¬ 
ities ; water of plasticity, 34.4% ; excessive drying shrinkage; linear drying 
shrinkage, 12.22% ; linear burning shrinkage, at 990 degrees C., 1.45% ; at mo 
G, 3.48% ; at 1230 C., 4.87% ; red burning; per cent porosity, at 850 degrees C., 
24.4%; at 950 C., 22.7%; at 980 C., 19.6%; at 1010 C., 18.7%; 1040 C., 
18.7%; at 1070 C., 17.4%; at 1100 C., 17.3%; at 1130 C., 16.8%; at 1160 C., 
16.9%; at 1190 C., 16.6%; at 1220 C., 14.4%; at 1250 C., 13.8%. A plastic red 
burning clay having a high drying shrinkage. Care must be exercised in drying 
heavy pieces. This clay has a relatively low porosity at commercial kiln tem¬ 
peratures and attains a fairly dense structure. 
Sample .N0. 21, Jefferson County. Medium plastic with fair working prop¬ 
erties; water of plasticity, 32.6%; no drying difficulties; linear drying shrink¬ 
age, 9.77% ; linear burning shrinkage, at 990 degrees C., 0.22% ; at mo C., 1.09% ; 
at 1230 C., 0.55%; at 1320 G, 0.49%; buff burning; per cent porosity, at 990 
degrees C., 35.6% ; at 1020 C., 34.0% ; at 1050 C., 33.2% ; at 1080 C., 33.4% ; 
at mo C., 33-8%; at 1140 C., 33-6%; at 1170 C., 33.6%; at 1200 C.,'33.7%; 
at 1230 C., 32.8%; at 12.60 C., 34.4%; at 1290 C., 33-7 % at 1320 C., 33.5%. A 
sandy buff burning clay which retains an open porous structure at temperatures 
up to 1320 degrees C. (2408 degrees F.). May have some use in the manufacture 
of soft porous common building brick. 
Sample No. 22, Polk County. Medium plastic with fair working properties: 
water of plasticity, 24.9% ; no drying difficulties; linear drying shrinkage 6.28% ; 
linear burning shrinkage, at 950 degrees C., 0.37% ; at 1100 C., 0.47% ; at 1220 
C, 0.08%; at 1310 C., 0.24%; burns red; per cent porosity, at 950 degrees C., 
35.6%; at 1010 C., 35.8%; at 1040 C., 35.6%; at 1070 C., 36.0%; at 1100 C., 
34.8% ; at 1130 C., 33-8%; at 1160 C., 33.8%; at 1190 C., 33.7%; at 1220 C., 
33.6%; at 1250 C., 33.7%; at 1280 C., 33.4%; at 1310 C., 33.6%. A sandy red 
burning material which retains an open porous structure at temperatures up to 
1320 degrees C. May have some use in the manufacture of soft porous common 
building brick. 
FULLER’S EARTH. 
The total production of fuller’s earth in the United States dur¬ 
ing 1914 was 40,981 short tons, an increase over the preceding year 
of 2.387 tons. In addition to that produced, there was imported in¬ 
to the United States during the year 22,302* * short tons, a substan¬ 
tial increase over the imports of the preceding year. Some fuller’s 
*From quarterly statement of imports, U. S. Department of Commerce, 
* Bureau of Foreign and Domestic Commerce. 
