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Full Download Thacher's Calculating Instrument, or Cylindrical Slide-Rule, Containing Rules and Directions - Edwin Thacher | ePub
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Excerpt from thacher's calculating instrument, or cylindrical slide-rule: containing complete and simple rules and directions for performing the greatest variety of useful calculations with unexampled rapidity and accuracy.
Thacher's calculating instrument or cylindrical slide-rule: containing complete and simple rules and directions for performing the greatest variety of useful calculations with unexampled rapidity.
Thacher's calculating instrument or cylindrical slide-rule: containing complete and simple rules and directions for performing the greatest variety of with unexampled rapidity and accuracy paperback – january 1, 2010 by edwin thacher (author) 2 ratings see all formats and editions.
The thacher calculating instrument appeared after 1880 and was produced for a number of decades w this is a look at a truly unique cylindrical slide rule.
Containing complete and simple rules and directions for performing the greatest variety of useful.
This is a thacher's calculating instrument in exceptionally fine overall condition, complete with case and instruction manual. In 1881, edwin thacher, an american bridge engineer patented this cylindrical slide rule, 4 inches in diameter and 18 inches long.
The thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line.
W26-05: thacher calculating instrument, patented by edwin thacher w26-06: palmer's computing.
In 1881, edwin thacher, a computing engineer for the keystone bridge company in pittsburgh, pennsylvania, received a patent for an improvement in slide rules. Thacher, a graduate of rennselaer polytechnic institute, spent much of his career designing railway bridges. To assist in his calculations, he designed a cylindrical slide rule.
Thacher's calculating instrument - edwin thacher, 1892 - first edition. This instruction manual is for the thacher calculating instrument. This instruction manual is for the thacher calculating instrument.
Thacher's calculating instrument: or cylindrical slide rule (1884) by edwin thacher reprinted by kessinger publishing.
Indeed, thacher's slide rule is huge, and comes in a mahogany box 60 cm long, the outcome is a desktop instrument capable of calculations accurate to four.
Ny, late 19th century the instrument raised on a wood stand mounted with directions and supported by two circular brass arms.
Thacher's calculating instrument is a advanced slide rule for performing a great variety of useful arithmetical calculations with rapidity and accuracy.
The instrument has an open brass cylindrical frame made of end rings connected by 20 horizonal triangular metal bars with printed scales glued to them; the ring.
Thacher's calculating instrument the instrument consists of a cylindrical slide provided with a knob at each end, and which admits of both rotary and longitudinal movement, within an open framework or envelope of equidistant bars of triangular section.
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