Monthly Tech-Tip from Tony Hansen SignUp

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1005 | 1002 | 1003 | 997 | 999 | 1000 | 1001 | 996 | 995 | 994 | 987 | 988 | 989 | 990 | 991 | 992 | 984 | 985 | 986 | 431 | 983 | 982 | 979 | 980 | 981 | 961 | 977 | 978 | 975 | 976 | 972 | 974 | 969 | 970 | 971 | 968 | 911 | 967 | 817 | 850 | 853 | 658 | 659 | 439 | 966 | 964 | 962 | 963 | 960 | 958 | 959 | 957 | 954 | 955 | 956 | 952 | 953 | 949 | 950 | 951 | 947 | 948 | 946 | 945 | 944 | 943 | 942 | 941 | 938 | 936 | 937 | 934 | 931 | 932 | 933 | 752 | 292 | 815 | 816 | 819 | 316 | 832 | 839 | 846 | 847 | 854 | 855 | 863 | 864 | 865 | 362 | 879 | 888 | 891 | 918 | 689 | 716 | 722 | 724 | 741 | 744 | 746 | 749 | 750 | 929 | 927 | 928 | 925 | 926 | 924 | 153 | 923 | 919 | 921 | 916 | 914 | 912 | 908 | 909 | 905 | 906 | 464 | 354 | 904 | 878 | 900 | 893 | 894 | 895 | 896 | 897 | 892 | 898 | 899 | 889 | 351 | 885 | 886 | 880 | 881 | 883 | 884 | 667 | 874 | 875 | 361 | 930 | 940 | 430 | 434 | 873 | 825 | 826 | 828 | 829 | 844 | 845 | 849 | 852 | 856 | 857 | 858 | 859 | 860 | 870 | 697 | 764 | 862 | 861 | 818 | 851 | 663 | 830 | 831 | 833 | 834 | 835 | 836 | 838 | 840 | 842 | 843 | 824 | 837 | 822 | 820 | 801 | 810 | 811 | 812 | 814 | 628 | 656 | 657 | 661 | 664 | 665 | 666 | 668 | 669 | 670 | 674 | 675 | 677 | 678 | 680 | 681 | 682 | 683 | 685 | 686 | 687 | 688 | 691 | 692 | 693 | 694 | 698 | 699 | 700 | 701 | 702 | 703 | 704 | 705 | 713 | 459 | 717 | 719 | 720 | 721 | 725 | 729 | 731 | 734 | 736 | 737 | 740 | 748 | 751 | 754 | 755 | 756 | 757 | 758 | 759 | 760 | 761 | 762 | 711 | 813 | 809 | 808 | 803 | 804 | 805 | 364 | 802 | 800 | 798 | 796 | 797 | 795 | 791 | 792 | 793 | 794 | 461 | 790 | 787 | 788 | 770 | 771 | 772 | 773 | 774 | 775 | 777 | 782 | 784 | 768 | 769 | 767 | 765 | 766 | 626 | 726 | 727 | 728 | 710 | 706 | 295 | 444 | 484 | 652 | 654 | 655 | 643 | 646 | 647 | 648 | 649 | 650 | 630 | 631 | 633 | 634 | 635 | 638 | 639 | 640 | 564 | 578 | 582 | 583 | 584 | 587 | 588 | 590 | 591 | 592 | 593 | 594 | 595 | 596 | 597 | 598 | 599 | 600 | 601 | 602 | 603 | 604 | 605 | 606 | 607 | 608 | 609 | 610 | 611 | 613 | 614 | 615 | 616 | 617 | 618 | 619 | 620 | 623 | 438 | 442 | 443 | 447 | 448 | 455 | 465 | 466 | 472 | 473 | 481 | 482 | 483 | 576 | 575 | 562 | 532 | 535 | 537 | 539 | 541 | 543 | 545 | 547 | 551 | 553 | 555 | 513 | 514 | 515 | 516 | 517 | 518 | 519 | 520 | 521 | 522 | 523 | 524 | 525 | 526 | 527 | 528 | 530 | 500 | 501 | 502 | 503 | 504 | 505 | 506 | 507 | 508 | 509 | 511 | 487 | 488 | 489 | 491 | 492 | 495 | 496 | 499 | 458 | 456 | 360 | 294 | 293 | 415 | 416 | 404 | 402 | 398 | 401 | 377 | 386 | 372 | 369 | 368 | 358 | 344 | 353 | 355 | 321 | 322 | 325 | 319 | 257 | 8 | 13 | 14 | 271 | 272 | 33 | 289 | 34 | 35 | 296 | 44 | 45 | 86 | 98 | 100 | 106 | 117 | 139 | 145 | 159 | 182 | 183 | 184 | 185 | 210 | 211 | 212 | 216 | 222 | 223 | 235 | 239 | 240 | 243 | 246 | 248 | 250 | 3587 | 3590 | 3160

New incentive to develop Canadian clays:

Reduce the “clay miles”.

The materials to make M340 travel 200km to get to our plant (from Ravenscrag, SK).
M370 is a different story. The kaolin (from Georgia) travels 3700km, the nepheline (from Ontario) travels 3100km, the silica (from Illinois) travels 2300km, the ball clay (from Tennessee) travels 2800km and the bentonite (from Wyoming) travels 1000km. Weighting each material distance by its percentage in the recipe calculates to 2900 clay-kilometres! Thus, all the boxes of M370 we make in a year travel about 60,000,000 km, enough to go to the moon and back 50+ times! This realization brings renewed motivation to develop new clay deposits, ones that are white enough to make an M370-like body and which are only 400km away. Until then, you can cut the mileage now: Use an engobe on M340 and make it whiter than M370 (and darker than Coffee clay).

New incentive to develop Canadian clays:
Reduce the “clay miles”.

Related Pictures

An 85-year-old Medalta Thrown Beer Bottle:

How can it be so white, speck-free and uncrazed?


This picture has its own page with more detail, click here to see it.

These (right) were made individually in the factory during the 1930s and 1940s (the insides have pronounced throwing rings and slip drips). The potters were able to make up to 500 per day, even though they took the time to smooth the outside using a rib! The inside base of this one is bowl-shaped (the walls near the base are very thick), this helps explain how they were able to throw them so quickly.

Perhaps most surprising is how much whiter and speck-free the bottle is even though it is fired four cones higher than the crock (Plainsman M340 at cone 6). Both pieces have porosities above 2%. Why? First, they got their clay from further east in Saskatchewan (near Willows), where the cleanest clays are much lower in iron contamination (likely the H0009 body). The whiteness is better even though they would have had to add some ball clay to make the clays more wheel-throwable. Second, they employed a wet process to refine the clay (slaking, blunging, sieving and filter pressing), this enabled them to sieve out the iron pyrite particles. Fortunately, modern dry grinding and air separation equipment is greener and able to accomplish without water.

Notice also the transparent G1129 glaze on the beer bottle (the upper section is likely the same glaze stained using iron oxide): After almost 100 years it has not crazed. This is both a testament to the ease of glaze fit these natural materials offer (because of the high quartz content) and the skill of the engineers of the time at matching the thermal expansion of glaze and body.

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