Transactions . in the case of longer blasts being madeat this furnace, to blow down occasionally, and cut out the deposit(a job that will not be easily accomplished, as the substance is veryhard), and take it out of the top of the furnace, not allowing it tode-scend into the hearth. The furnace in question has spells of several days duration, whenthe hearth is filled with the flame of burning zinc, and scarcely any-thing but this characteristic green flame can be seen at the cindernotch and tapping-hole. Pieces of zinc are carried along on thesurface of the cinder and iron \vhile running, givi
Transactions . in the case of longer blasts being madeat this furnace, to blow down occasionally, and cut out the deposit(a job that will not be easily accomplished, as the substance is veryhard), and take it out of the top of the furnace, not allowing it tode-scend into the hearth. The furnace in question has spells of several days duration, whenthe hearth is filled with the flame of burning zinc, and scarcely any-thing but this characteristic green flame can be seen at the cindernotch and tapping-hole. Pieces of zinc are carried along on thesurface of the cinder and iron \vhile running, giving off the greenflame as they pass, and leaving on the top of the cinder a deposit ofoxide of zinc, yellow while the cinder is hot, but changing to a purewhite when cold. One of the most peculiar things in this connec- VOL. VII.—7 98 NOTE ON A DEPOSIT OF CADMIA IN A COKE FURNACE. tion, and one which the writer never heard mentioned before, is theescaping of metallic zinc through the cracks of the hearth. This. takes place at the level of the tuyeres, and thence up, for a height ofthree or four feet. One hundred to one hundred and fifty pounds NOTE ON A DEPOSIT OF CADMIA IN A COKE FURNACE. 99 iniglit possibly be collected in this way during a years run. Intearing out an old hearth many of the biicks are found permeated byglobules of metallic zinc, the bricks being much shattered. Whetherthe bricks are first shattered, and the zinc then runs into the cracks,or whether the zinc is instrumental in the shattering, is an unsettledquestion, but it is quite certain that great difficulty has been experi-enced in getting the hearths to stand. PROCEEDINGS LAKE GEORGE AND LAKE CHAM-PLAIN MEETING, OCTOBER, 1878. PROCEEDINGS OF THE LAKE GEORGE MEETING. 103 The members arrived at Ticonderoga, N. Y., at noon, Tuesday,October loth, and were received by Mr. Cyrus Butler, Chairman ofthe Local Committee of Arrangements. During the afternoon theworks of the American Graphite Company a
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
