An Essay On The Cardinal Points; Being A Collection Of Authorities In Explanation Of The Terms…

Paperback | February 1, 2012

byNoah Barker

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1864. Excerpt: ... thus ascertained, and the compass adjusted accordingly. It was for the purpose of making these adjustments, so that all compasses should exactly correspond, not only with each other, but with the true meridian, that the Nonius and Vernier were invented. The "Vernier" is so named from its inventor, Peter Vernier, in 1631, being coeval with the earliest surveys made in this country. And this method of adjusting surveying-instruments is as well understood in New Hampshire, as in any State in the Union, notwithstanding Mr. Pitman's plea of "Ignorance" for his native State! Indeed, the Instrument with which I have made all my surveys for the last 20 years--Sargent's Purchase included--was manufactured in Concord, N. H., by Abiel Chandler, than whom a more skillful Instrument-maker is rarely to be found. An instrument of still later invention than the Transit or Vernier Compass, is " Burt's Solar Compass." This is an instrument by which, when adjusted for the sun's declination, and Latitude of the place, the azimuth of any line from the true North and South can be read off, and the difference between it and the Bearing by the compass will then be the variation. Now, in answer to the question, "which of the compasses is right, and which is wrong?" we should say, that all are right, with their proper adjustment; and all are wrong without it. We speak not only from practical knowledge on this subject, but from 'authority.' We would refer the reader to "Davies' Surveying," aforesaid, p. 127, articles 153, 154, and 155; also p. 132, art. 159. The articles here referred to, show the impropriety of adopting the compass as " our only guide," without properly adjusting it for correct practice; and while on this topic, we would refer the reader to " Flint's Surveying," a...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1864. Excerpt: ... thus ascertained, and the compass adjusted accordingly. It was for the purpose of making these adjustments, so that all compas...

Format:PaperbackDimensions:20 pages, 9.69 × 7.44 × 0.04 inPublished:February 1, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217810675

ISBN - 13:9780217810678

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