Bulletin of the Bureau of Standards, Vol. 10, 295-313 (1914) Scientific Paper 212 (S212)
The Arsem vacuum furnace previously used was slightly modified, and arrangements were made to sweep out the smoke from the heated oxides which affects the optical pyrometer readings. The materials as a rule are charged into the ring space between an outer and an inner tube; some gas (hydrogen, nitrogen, etc.), is passed down the inner tube, into which the pyrometer is sighted. The tubes are made of graphite or of tungsten, the latter being moulded in graphite. The pyrometer lamps were standardised with the aid of the melting-points (determined in graphite crucibles) of: Antimony, 630 degrees copper-silver eutectic, 779 degrees ; silver, 960.5 degrees ; copper, 1083 degrees ; diopside, 1391 degrees C.%2
Canon EOS 5D Mark II
ABBYY FineReader 8.0
Possible copyright status
The Bulletin of the Bureau of Standards is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder.