Identifier: crockeryglassjou78newy (find matches)
Title: Crockery & glass journal
Year: 1875 (1870s)
Authors:
Subjects: Pottery Glass Glassware
Publisher: New York : G. Whittemore & Co.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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e recorder six records could beobtained without difficulty. A reproduction of the tem-perature record of a biscuit oven recorded over a periodof six days in the works of Maw & Co., Jackfield, wasshown. It was interesting to notice the very slow rise intemperature during the first day, the temperature risingvery much more rapidly during the second day, and fair-ly slowly during the next two days. When a temperature of 800 deg. was recorded, thethermo-couple was removed from the tube, the Ferypyrometer being substituded for it, and the temperaturesup to about 1,050 deg. C. were recorded with this instru-ment. He believed that the temperatures obtained in thesefurnaces were lower than those met with in many bis-cuit ovens, so that the full advantage of the Fery pyro-meter was not really shown. If, however, a tempera-ture of 1,400 deg. C. had been reached (and he had meas-ured such a temperature in a biscuit oven), then no pyro-meter other than a radiation or optical one would have 63
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The call for novelties in illuminants has beenheeded by manufacturers to such an extentthat the adaptation of old customs to moderndevices has become somewhat of a problem. Iffanglng l^ MlUtUtoe. t- 65 successfulh withstood this tcni)ierature for any length oftime. It might he, liowever, that a small works ct)uUl not af-fonl to install recorders, and in that case direct reading-instruments might he suhstituted for recorders. The di-rect reading instrument consists of a moving coil galvan-ometer, the pointer of which is deflected over a scale, thetemperatures heing read directly on the scale. The gal-vanometer is provided with two scales, the first for usewith the thermo-couple 0 to 700 deg. C, the second foruse with the Fery pyrometer 600 to 1,400 deg. C. A method of obtaining a very open scale by meansof a strong form of potentiometer had lately been intro-duced, practicall)- doubhng the accuracy obtained withthese simple galvanometers. Mr. Whipple explained that the same magnificati

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