546 



INDEX. 



Page 



Ries, Heinrich, work of, xxv 



Ring pits, 225 



Riveredge, clay pit at, 128 



Robbinsville, clay near, 432 



Roberts, E. F., clay bank of, 178 



Rocky Hill, clay near, 503 



Rosenhayn, clay at, 411 



Rupp & Sawyer, clay pit of, 370 



Rutile, in clays, 47-69 



Ryan, P. J., clay of, 459 



Saggers, 300 



Sagger clay 215, 338, 339 



Salem county, clay deposits of, ... .494-502 

 clay-working industry of,.... 502 



Salt glaze, 301 



Sand bed, No. 1, fire sands, 191 



No. 2, Raritan clay series,. . . 177 

 No. 3, Raritan clay series,. . . 172 

 No. 4, Raritan clay series,. . . 168 



Sand, effect on air shrinkage, 92 



effect on tensile strength, 92 



effect on fusibility,. .99, 315, 328-332 



fluffy, 144 



in clay, 54-55 



micaceous, 353 



size of grains, 108 



Sand Hills, clays at,. .446, 447, 448, 449, 450 



Sanitary ware, 303, 309 



clays for, 296 



value in 1902, 309 



Saucelein, T., clay of, 383 



Sayre & Fisher Company, clay pits of, 



467, 468 

 Sayreville, clays at and near,. .452, 467, 468 



Scattergood, W., clay of, 390 



Schooleys Mountain, clay at, 479 



Scott, Joseph, clay of, 379 



Scove kiln, 240 



Secondary changes in clay deposits,.. 14 



Sedimentary clay, 8, 11, 82 



Seger, Herman, 58, 61, 101, 312,321 



experiments by, 70 



Seger cones, description and table of, 101 



Semidry-press molding, 230 



Semirefractory clays, 100 



fusion tests on, 463 



Middlesex count y, 455-463 



Seven Stars, clay at, 491 



Shaft mining in South Amboy dis- 

 trict, 32 



Shale (see also Triassic shales and 

 Hudson shales.) 



formation of, 24 



Kingsland, 374 



mining of, 36 



Shiloh marl, The, 141 



Page 



Shrinkage, 91-97 



air, 72,91-93 



effect of sand on, 92 



tables of, 249, 346-364, 



525—527 



fire, 93 



rate of, table, 94 



tables of, 249, 346-364, 



525-527 



fireproofing, 282 



measurements, bricks, ....248,249 



Siderite, in clays, 45 



Silica, 54 



effect in fire brick, 326-332 



effect in fire clay, 312—317 



Silicates, 54 



Silica-kaolin-titanium mixtures, fusion 



of, 31& 



Silt, size of grains, 108 



Silurian formations, 206 



Simpson, Spencer, 487 



Singac Brick Company, 493 



Singac, clay near, 13, 493 



Slaking of clay, 112- 



Slip clay, 301 



Slip glaze, see Glazing pottery. 



Smock, J. C., leaf-bed, 190- 



Soak pits, 225 



Soda in clay, effect of, 67 



Soft-mud molding, 226- 



Softening of clay deposits, 22 



Soluble salts in clays, 75 



origin of, 75 



prevention of, 78 



quantity of, 76 



Somerset county, clay deposits in,... 503 

 clay-working industry of,.... 504 



Somerville, clay at, 130, 503 



South, Joseph, clay pit of, 428 



South Amboy, clay at, 454 



South Amboy district, shaft mining in, 32 



South Amboy fire clay, 173 



thickness of, 175 



Southard, clay at, 478 



South Park, clay at, 388 



Spar, 296 



Spa Spring, clay at, 464 



Specific gravity of clay, 114 



Standard Brick Company, 493 



State College, Department of Ceramics 



at, 293 



Standard Fireproofing Company's sand 



pits, 179 



Statistics of clay production, 509-512 



Stiff-mud molding, 228 



Stoneware, see Pottery. 



Stoneware clays, 215, 295, 337 



amount mined in 1902, 340 



definition of, 214 



Middlesex county, 453,459 



