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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. 1778 Excerpt: ... Scales, in Manner following, viz. By the Slider. Set Sine 500 30'on the fixt Piece, against Radius on the Slide, then against T. 52 50' on the lower fixt Piece, you will have about 59? 45', on the Tangent Slide; then draw out the Slide, and set-, the-, said 59 45' Tangent against Radius, and in the right. Line of the Index over 58.8 NorrtK you will find 100 Num. and with a little Attention it may be easily seen that the sliding Radius has been removed forwards from Sine 500 3c' to rhe fixt Radius, and. by a second Motion beyond the fixt Radius to 520 50' on the Tangents, at the.same Time carrying 58.8 on the.Line of Numbers along with it, to 100, the fourth Term required. With-Compaflei.. The Extent from Tangent 450 to T. 52 50', being laid' en the Sines from 500 30' backwards (which may be called the Reduction of Tangents to Sines) will reach to about 35 3; then the Extent from this Point, or S. 350 30' to Sine 90, being laid from 58.8 m. on the Line of Numbers encreafing, will reach to 100 m.paulo flw. The rest are left for the Reader's Exercise. 'Longitude' failed'-from r= 50 14' W., Diff. o/ ongitude 100 m. or 1 40 Westerly.: Add. gives Long, the Ship is in SS 6 54 W. The Use of the Scales in Mcrcator's Sailing, r i...-. i-This is very improperly called Mercator's, as it was the sole Invention f Mr. Edward Wright, a Native of England, matriculated in Caius College, Cambridge, and flourished about the Year 1590. Current Report has indeed censured Mercator for fraudulently, or in breach of Trust, obtaining the Principles from Wright, but neither is this true, for Gerrard Msrcaior lived, and published hrs Univerfal Map of the World some. Years-before Wright's Correction of Errors appeared, nor was the last a Plagiary upon the first;...

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