930 



NEW YOKK STATE MUSEUM 



Chromium, 51 IS 567°. 



Chromium oxid, 777°. 



Chromolithographic decoration, 816°- 

 17^ 



Cimolite, 505^. 



Cistern brick, 645°. 



Clamp, 674^ 



Clarkson, brick yard, 722^. 



Classification of clays, 564^-71°. 



Clay, absorption, 515°, 528^-29S 546=; 

 methods of analyzing, 530'-38''; 

 burned, 549°-5(F; chemical effects of 

 heating, 561°-63''; chemical proper- 

 ties, 510^-38^; classification, 564^- 

 71°; clay substance, 497^ 510°; color, 

 515S 515°, 517°, 519S 521^ 527^-28S 

 565°-71S 574°. 577^ 610^; crumpling, 

 593=, 597', 603^ 606=; definition, 496^ 

 497^; formation, 500^; fusibility, 

 512*, 550'-61S 562«; impurities, 508S 

 511°-28*; adaptable to different 

 molding methods, 667^-68'; miner- 

 alogy, 503^-9"; origin and nature, 

 496^-502°; physical properties, 510', 

 538'-6P; plasticity, 496=, 504?, 528», 

 530^ 539^-44^ 637S 845'; porosity, 

 522°, 672=; preparation of, 655''-60'; 

 properties, 510^-63'; pure, 500^ 505», 

 5-lOS 511*, 511°; purification, 633"- 

 35«; refractoriness, 511°, 526^ 563'; 

 shrinkage, 522=, 529S 530°, 545'-50S 

 636»-37^ 637S 639', 672'; method of 

 counteracting shrinkage, 547^-50'; 

 tensile strength, 541=, 544'-45°, 637'; 

 uses, 564'-65=, 636^-42', 845^-53'. See 

 also Analyses; Brick clays; China 

 clays; Fire clays; Flint clays; Glass- 

 pot clays; Kaolin; Paving brick 

 clays; Pottery clays; Residual clays; 

 Sedimentary clays; Slip clays; Stone- 

 ware clays. 



Clay banks, ownership, 685''-86^. 



Clay conveyor, illus. facing p. 660, 761. 



Clay deposits, geologic distribution, 

 572^-627'; unstratified material 

 found with, 592°; illus. facing p. 

 592; structure, 628^-29'; sections of, 

 table, 858-59. 

 Clay dogs, 507'. 



Clay industry, statistics, 493'-94'; 

 growth, 494^; adoption of modern 

 methods of molding and burning, 

 495'; conduct of business, 685''-86'. 

 Clay wares, testing, 854-57. 

 Clay workers, directory, 913^-25*. 

 Clay working, 628^-35°. 

 Cleansing clay, 633»-35'. 

 Clifton, clay deposits, 607'. 

 Clinton county, brick yards, 709'-10*. 

 Clinton shale, 828\ 



Coal, used in burning calcareous clays, 

 642°. 



Coal dust in brick, 675^ 676=. 



Coats, William, brick yard, 712'. 



Cobalt oxid, 567=, 777°. 



Cobbles, 582S 583*, 583», 586S 587% 

 592°. 



Coe, S. E., brick yard, 714% 



Coeymans Landing, terrace, 591^; brick 

 yards, 704^-6'; clay deposits, 588% 

 704»-6'. 



Cohoes, brick yards, 708^; clay de- 

 posits, 708\ 



Coke, used to prevent shrinkage, 548^, 

 550=. 



Coke oven brick, 785=. 



Coldspring, delta deposits, 588'; brick 

 yard, 695S 



Coldspring Harbor, stratification, 597'- 

 98=; clay deposits, 734°; illus. facing 

 p. 735. 



Collins, J. H., on kaolinization of 

 feldspars, 498'. 



Collyrite in clay, 505'. 



Color, of clay, 515% 515% 517% 519% 

 521% 527'-28% 565°-71% 574°, 577% 

 610=; of brick clay, 639'-42'; of 

 decorative tile, 777°; of fire clay, 

 782*; of paving brick, 744'; of 

 pressed brick, 646^ 



Colorado, clay deposits, 572', 612'-14^ 



Columbia county, brick yards, 703°-4'; 

 shale, 826'. 



Common brick, absorption, 643% 644; 

 burning, 672% 673% 673°; crushing 

 strength, 643°; different grades, 

 645=-47='; table of dimensions, 643'; 

 requisites; 643'; standard size, 643'; 

 tests, 648°; value of output, 493% 

 494'; 



manufacture: 645% 650=; clay used, 

 521=, 636*; in Colorado, 613'; con- 

 tinuous kilns used, 679*; manufac- 

 turers in New York state, 913'-25*; 

 shale used, 495% 686'. See also Brick 

 clays. 



Concretions, sand, 585=; clay, 593"- 



94% 602% 604'. 

 Cones, Seger, 553'-58'. 



Conewango, clay deposits, 576^. 



Connecticut, clay deposits, 572% 614*. 

 Continuous kilns, 495% 678'-79% 814«; 



illus. facing p. 679. 

 Cook, G. H., on quartz in clay, 525*; 



on plasticity of clays, 539'. 

 Cooney & Farrell, brick yard, 700'. 

 Copenhagen biscuit ware, composition, 



796°. 

 Copper oxid, 777'. 



Cornell university. New York_ state 

 veterinary college, illus. facing p. 

 719. 



