CLAY 645
and for sealing oil wells; and adobe and shale dust, used for rockdusting
coal mines, etc. Clay used for brickmaking, which has been mined on royalty
or sold raw, is listed under "Miscellaneous clays" as the quantity is negligible
compared with the total quantity used for brick and block making.
 Imports and exports.—Total imports of clay in 1932 decreased 33 percent
in quantity and 43 percent in value compared with 1931. Imports of kaolin,
or china clay, which constituted 79 percent of the total quantity of clay
imported in 1932, decreased 34 percent ~n quantity and 56 percent in value.

Clay imported for consumption in the United States, 1928—32
Year
Kaolin or china
clay

Common blue
and Gross-Al.
merode glass.
pot clay

All other clays


Total






Unwrought

Wrought



Short
tons
Value
Short
tons
Value
Short
tons
Value
Sirt Value
 1,653 $23, 564 12,283 154, 158
' 4,984 11143,817
' 8, 376 1237,859
' 8, 133 1280,404
Short
tons
Value
1928      
1929      
1930      
1931      
1932      
307,304
279,981
236,251
151,426
99,807
$2,962,269
2,700,296
2, 197, 540
1,056,393
461, 191
10, 259
28,008
18, 900
15, 183
5,880
$90, 7~
268,011
154,428
116,446
45,445
51,163
49,324
24,883
15, 615
13, 290
$429, 788
420,689
209, 175
125,326
90, 140

370,379
369,596
1285, 018
1 190,600
' 127, 110
$3, 506,363
3, 543, 154
' 2, 704, 960
' 1, 536,024
' 877, 180
 1 Includes "clays or earths, artificially activated with acid or other material
", as follows: 1930 (June 18 to Dec. 31), 2,663 short tons, valued at $100,779;
1931, 4,912 tons, $184,381; not separately classified prior to change in
tariff; 1932, 7,328 tons, $267,560.


 Exports of domestic clays in 1932 decreased 24 percent in quantity compared
with 1931. Exports of fire clay, constituting 27 percent of the total quantity
and 22 percent of the total value of clay exported in 1932, decreased 51
percent in quantity and 31 percent in value.

Domestic clay exported from the United States, 1928—32
Year
Fire clay

All other

Total


Short tons
Value
Short tons
Value
Short tons
Value
1928                      
1929                    
1930                    
1931                    
1932                    
60, 138
76, 561
62, 660
45,314
22, 086
$494, 241
588, 770
519, 788
329, 112
228,073
60,911
76,789
73,870
61,369
59, 273
$896, 350
1,117,312
1,108,536
915, 743
826,550
121,049
153,350
136,530
106,708
81,359
$1, 390,591
1, 706,082
1,628,374
1, 244,855
1,054,623