File:The fireside university of modern invention, discovery, industry and art for home circle study and entertainment (1902) (14756521036).jpg

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Identifier: firesideuniversi01mcgo (find matches)
Title: The fireside university of modern invention, discovery, industry and art for home circle study and entertainment
Year: 1902 (1900s)
Authors: McGovern, John. (from old catalog)
Subjects: Science
Publisher: Chicago, Union pub. house
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Calcium, lead, barium, strontium, magnesium,aluminium, zinc, or thallium. (For colored Glass): Iron, manga-nese, copper, chromium, uranium, cobalt, arsenic, or gold. Inbrief, Glass is a silicate or borate of at least two metals, and oneof these metals must be an alkali. The molecule of Glass maybe theorized, in the most simple manner, as three oxygen mole-cules, each one holding a molecule respectively of sodium (orpotassium), of calcium, and of silicon (or boron)—that is, soda(or potash), lime and sand (or borax, which also has soda in it).(See Chemistry.) 421 4*2 THE FIRESIDE UNIVERSITY. Illicit is required for Glass-making? A very great heat, and as most Glass articles are small, theGlass furnace is often divided into small pots or compartments.Siemens and Stevenson invented tank furnaces, to do away withthe little pots, but each plan has its advocates. Usually, a Glassfactory—as at the Worlds Fair of 1893—is a tent-like structure,in which the tall chimney is the centre-pole.
Text Appearing After Image:
Fig. 162. FASHIONING GLASS SHADES. How is this Glass bowl made ? A man gathers molten Glass on a rod and holds it over the GLASS. 423 mold; the pressman clips off the hot metal with shears; themass drops into the mold; the mold is shut and pressed andthe bowl is taken out, still red hot. It can now be furtherheated, wrought with a block of wood, and is cooled in a temper-ing oven. How are the molds made ? They are of iron, jointed in many places, so that they can beopened without breaking the Glass. When a vase or pitcheris smaller at the top than some part of its interior, it has beenwrought with the wooden block; ory it has been moldedanother way.

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Flickr tags
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  • bookid:firesideuniversi01mcgo
  • bookyear:1902
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:McGovern__John___from_old_catalog_
  • booksubject:Science
  • bookpublisher:Chicago__Union_pub__house
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:467
  • bookcollection:library_of_congress
  • bookcollection:americana
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29 July 2014
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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14756521036. It was reviewed on 8 October 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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