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Feldspars of the pacific northwest
u.
162
s. BURL4U
OF
MINES
TC'O'I'ES.
[J.F.
I.
nels back of the lining, part of the air required for combustion, and indirect cooling by supplementin, w the heat-absorbing surface of the boiler tubes with sidewall heating surface, water-tube slag screens, and radiant super-heaters. The temperature in the furnace depends, among other causes, partly on the area of exposed surfaces that absorb radiant heat, so that increasing the heatabsorbing area tends to lower the mean temperature of the In the bureau’s experiments comparative data furnace gases. were obtained on the temperature distribution with the different types of fuel burners tested, and on the temperatures attained in these furnaces. Further details are given in a report to be published by the Jozrrmd of the Society. FELDSPARS
OF
THE
PACIFIC
By Hewitt
NORTHWEST.
Wilson.
Bureau of Mines has investigated the possible sources of feldspar and flint in the Pacific Northwest that may be of The commercial use in the manufacture of ceramic products. data were obtained in co6peration with the University of Jliashington, which is conductin g a study of the ceramic properties of kaolins of Washington and Idaho at the present time. It is important, in respect to utilization of the kaolins, that sources of feldspar and flint be considered, in order to have the three principal components of white ware. It was found that the flint could be most easily produced by grinding the purified quartz sand washed from the kaolins. The feldspars discovered in the Northwest are soda feldspars, with the exception of two small deposits Deposits of commercial grade are found on of potash feldspar. near Avon, Idaho, on Ashland and Orcas Island, Washington, Gold Creek, Oregon, and Big Lake, Washington. Deposits are also known to exist near Yale. British Columbia, and on Douglas The data obtained indicate that the Channel, British Columbia. Pacific Northwest will be largely dependent on soda feldspar. The deposit at Deer Harbor is with respect to quantity, ease of mining and transportation, the most important source of feldspar for a future white-ware industry. The results will be published in more detail by the Eureau of Mines. THE
162
s. BURL4U
OF
MINES
TC'O'I'ES.
[J.F.
I.
nels back of the lining, part of the air required for combustion, and indirect cooling by supplementin, w the heat-absorbing surface of the boiler tubes with sidewall heating surface, water-tube slag screens, and radiant super-heaters. The temperature in the furnace depends, among other causes, partly on the area of exposed surfaces that absorb radiant heat, so that increasing the heatabsorbing area tends to lower the mean temperature of the In the bureau’s experiments comparative data furnace gases. were obtained on the temperature distribution with the different types of fuel burners tested, and on the temperatures attained in these furnaces. Further details are given in a report to be published by the Jozrrmd of the Society. FELDSPARS
OF
THE
PACIFIC
By Hewitt
NORTHWEST.
Wilson.
Bureau of Mines has investigated the possible sources of feldspar and flint in the Pacific Northwest that may be of The commercial use in the manufacture of ceramic products. data were obtained in co6peration with the University of Jliashington, which is conductin g a study of the ceramic properties of kaolins of Washington and Idaho at the present time. It is important, in respect to utilization of the kaolins, that sources of feldspar and flint be considered, in order to have the three principal components of white ware. It was found that the flint could be most easily produced by grinding the purified quartz sand washed from the kaolins. The feldspars discovered in the Northwest are soda feldspars, with the exception of two small deposits Deposits of commercial grade are found on of potash feldspar. near Avon, Idaho, on Ashland and Orcas Island, Washington, Gold Creek, Oregon, and Big Lake, Washington. Deposits are also known to exist near Yale. British Columbia, and on Douglas The data obtained indicate that the Channel, British Columbia. Pacific Northwest will be largely dependent on soda feldspar. The deposit at Deer Harbor is with respect to quantity, ease of mining and transportation, the most important source of feldspar for a future white-ware industry. The results will be published in more detail by the Eureau of Mines. THE