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Image taken from page 820 of ‘The Voyages and Travels of Capt. Cook, Mungo Park, La Perouse, and others; … with a … geographical description of the World. Embellished with … engravings and maps. (The World or the present state of the Universe. … V
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Title: "The Voyages and Travels of Capt. Cook, Mungo Park, La Perouse, and others; … with a … geographical description of the World. Embellished with … engravings and maps. (The World or the present state of the Universe. … Vol. II.)"
Author: PELHAM, Cavendish.
Shelfmark: "British Library HMNTS 10026.l.2."
Volume: 02
Page: 820
Place of Publishing: Liverpool
Date of Publishing: 1808
Issuance: monographic
Identifier: 002811257
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Image from page 356 of “The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice” (1921)
Image by Internet Archive Book Images
Identifier: manufactureofpul03join
Title: The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice
Year: 1921 (1920s)
Authors: Joint Textbook Committee of the Paper Industry Stephenson, J. Newell
Subjects: Papermaking Wood-pulp
Publisher: New York : McGraw-Hill Book Company
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries
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Text Appearing Before Image:
h is a repro-duction of an actual temperature chart of a days run when every-thing was working right. The chart was taken on an 8-ft. by30-ft. digester having injector circulation; it shows curves fortwo complete cooks and for parts of two others. The chart wasput on the recorder at 3:30 p.m., as indicated bjT the point a.Curve A, from a to c, shows how the temperature ran duringthe last part of the cook in progress when the chart was changed;curve B, from c to h, shows how it ran during an entire cook;curve C, from h to r, shows how it ran for another entire THE COOKING PROCESS IN A SODA MILL 39 cook; and curve D, from s to u, shows how it ran for the firsthalf of the fourth cook. The chart here shown is about one-third the actual size. Considering curve C, at point h, the straight line to point ishows that the temperature is falling fast from about 275°F.,on account of putting cold chips into the hot digester. From ito j, the temperature rises to about 170°, as a result of the hot
Text Appearing After Image:
Fig. 12. liquor, which has soon covered the thermometer bulb. Thedigester is put on (steaming begins) at point k, and the tempera-ture increases to 225° at I, when the curve mounts more slowlyfor about half an hour; it then rises rapidly to point m, whereits rise is again slowed down until point n is reached; from thispoint, the rise in temperature is slower until the cook is finished.A rapid rise in pressure (as shown by the pressure gauge at thecorresponding times) without a corresponding rise in temperature, 40 MANUFACTURE OF SODA PULP §5 would indicate a fictitious, or gas pressure, and the relief valveshould be opened to correct this. The digester is relieved at point o and again at p, preparatory toblowing. At point q, the digester is blown, and the temperaturerapidly falls to 250° at point r. Something may also be learned regarding how the digester isworking by putting one end of a wooden stick or iron rod on thehead of the digester and placing the ear close to the other end
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