Tests of Transparency

1894 Scientific American  
� . == ��������==============�================ been made from the top and at an angle projecting outward. When its end has pass('d the center of the LOSS IN WEIGHT. 98-79 per cent. ; but nothing else llIade so much differ ence. The diaphaneity of carbon bisulphide, 141 ' 70, exceeds that of glass, which is 140'7 7; and it is noted that carbon tetrachloride. which has the index 145'77 is more diaphanous than air; which stauds at 142-26 i� the same scale. eye the operator changes the angle and
more » ... es the in -. The � oss in w �i ght e,ncountered in drying the follow strument a slight turn between his fingers so a � to m g art rc les, as found In commerce, are: bring the little pointed knife inward. He r:.ow presses Citric acid, 8 to 10 per cent. the latter into the lower part of the sac containing the Sodium bicarbonate, 2 to 3 per cent.
doi:10.1038/scientificamerican06301894-15421bsupp fatcat:vpgffsqqcrbgdku7khulg6lfty