524 Dr. Herschel's Experiments on the solar, and 



Table VI. 



Rays of flame. Fire. Invisible heat. 



Bluish-white glass stops - 625 - 750 - 700 



Flint glass - - - 591 - 750 - 533 



Crown glass - 636 - 722 - 783 



Coach glass - 458 - 714 - 625 



Iceland crystal - - 516 - 756 - 726 



Talc - - - - ^75 - 7*3 - 6l 5 



Very dark red glass - 636 - 613 



Dark-red - - - 526 - 5J3 - 630 



Orange - - - - 560 - 643 - 524 



Yellow - - 583 - 685 -■ 531 



Pale-green - 500 - 688 - 632 



Dark-green - - - 739 - 745 - 7 00 



Bluish-green - - 652 - 696 - 556 



Pale-blue - _ ■ - - 609 - 676 - 548 



Dark-blue - - - 619 - 704 - 632 



Indigo - - - -679-721 - 659 



Pale-indigo - - 571 655 - 700 



Purple - 520 - 679 - 730 



Violet - 500 615 - 684 



Crown glass, one side rough 741 - 723 - 775 



Coach glass, ditto - - 667 - 758 - 741 



Crown glass, both sides rough 615 - 791 » 833 



Coach glass, both - - 680 - 854 - 769 



The two last but two, together 720 - 849 



The two last together - 667 - 897 



The four last together r 870 - 902 



Olive-colour, burnt in glass 792 - 849 - 6g6 



White paper -'.•■--',- 79% m 9 12 " 585 



White linen - 690 - 910 - 457 



White persian - - 593 - 829 - — <-* 



Black muslin - - 565 706 - ~-~ 



