Bulletin of the Bureau of Standards Volume 10.cUnited States National Standards
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Author: United States National Standards
Number of Pages: 186 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231177310
File size: 21 Mb
File Name: Bulletin.of.the.Bureau.of.Standards.Volume.10.pdf
Download Link: Bulletin of the Bureau of Standards Volume 10
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...within wide limits. In addition to the salt-water rheostat, wire rheostats were placed in the heating circuit. It consisted of a cypress box of two compartments, each measuring 30 cm by 35 cm by 35 cm, in each of which were two copper plates (35 cm by 26 cm), placed 30 cm apart at the bottom and 1 cm apart at the top. A metal box through which cold water was circulated for the purpose of keeping the salt water cool was placed on each side of the partition. The outside copper plate in each compartment besides performing its functions as an electrode also formed one side of a wedge which opened at the top and could be filled with water before starting a run. This was done to cause the water which was fed at a constant rate from a Mariotte bottle to rise between the copper plates at a faster rate as the temperature of the furnace increased, thus overcoming the greater radiation losses to which the furnace is subjected at the higher temperatures and thereby giving a very constant rate over the whole range. When taking cooling curves the water in the wedges was kept at the same level as the water in the compartment by connecting the two with a siphon; thus all the water was siphoned off at the same rate. A series of brass outlets were constructed and calibrated for this rheostat which gave a series of definite times of heating or cooling of the furnace, ranging from a few minutes to several hours. THE MATERIALS INVESTIGATED Sources of Iron.--It was considered worth while to examine the thermal behavior of several samples of pure iron prepared by different methods and subjected to various preliminary treatments. We are indebted to Prof. C. F. Burgess, of Wisconsin, who furnished three samples of his electrolytic iron in the form of cathode plates together with an...
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