File:An elementary book on electricity and magnetism and their applications (1919) (14783495412).jpg

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Identifier: elementarybookon00jack (find matches)
Title: An elementary book on electricity and magnetism and their applications
Year: 1919 (1910s)
Authors: Jackson, Dugald C. (Dugald Caleb), 1865-1951 Jackson, John Price, b. 1868 Black, Newton Henry, b. 1874
Subjects: Electricity Magnetism
Publisher: New York, The Macmillian Co
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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• • NUMERALS Z• • • • •• • 3 4• • • ^™ • • • •• ■ _ mm 6 — i • • 8 - 9mm • • • • — • • — PUNCTUATION MARKS 0 Period • • • Comma Interrogation Dollar mark« ^ • • i^ • • • • • mm, « • Fig. 60. — Morse code as used in America. this country. The international code, which is used all overthe world in radiotelegraphy and for submarine lines, and forland lines in nearly all countries except the United States, isgiven in Chapter XXII. 74. Telegraph relays. Telegraph sounders require only afraction of an ampere to operate them; but to cause thatfraction to flow through a long line, which necessarily has ahigh resistance, requires the use of a battery with a very largenumber of cells. This is undesirable because the cells areexpensive to buy and to keep up. Long telegraph lines,therefore, are furnished with instruments which operate likesounders, but which are mfede very sensitive by placing a great PLATE Vi.
Text Appearing After Image:
Samuel F. B. Morse (1791-1872J. An American artist and inventor, was born at Charlestown (now part of Boston),Massachusetts, was graduated at Yale College in 1810, and in 1832 inventedthe commercial telegraph and the dot-and-dash alphabet known by his name.In 1844 by the aid of a 830,000 grant from Congress he built the first com-mercially successful telegraph line between Washington and Baltimore. ELECTRON AGNET1SM 103 ARMATURE CONTACTPOINTS ELECTRO MAGNET

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https://www.flickr.com/photos/internetarchivebookimages/14783495412/

Author Internet Archive Book Images
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Flickr tags
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  • bookid:elementarybookon00jack
  • bookyear:1919
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Jackson__Dugald_C___Dugald_Caleb___1865_1951
  • bookauthor:Jackson__John_Price__b__1868
  • bookauthor:Black__Newton_Henry__b__1874
  • booksubject:Electricity
  • booksubject:Magnetism
  • bookpublisher:New_York__The_Macmillian_Co
  • bookcontributor:Internet_Archive
  • booksponsor:Internet_Archive
  • bookleafnumber:126
  • bookcollection:internetarchivebooks
  • bookcollection:americana
Flickr posted date
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30 July 2014

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