Practical navigation, or, An introduction to the whole art : containing the doctrine of plain and spherical triangles : plain, mercator, great-circle sailing, and astronomical problems : the use of divers instruments ... : sundry useful tables in navigation, and a table of 10,000 logarithms, and of the logarithm-sines, tangents, and secants / by John Seller.
- John Seller
- Date:
- 1694
Licence: Public Domain Mark
Credit: Practical navigation, or, An introduction to the whole art : containing the doctrine of plain and spherical triangles : plain, mercator, great-circle sailing, and astronomical problems : the use of divers instruments ... : sundry useful tables in navigation, and a table of 10,000 logarithms, and of the logarithm-sines, tangents, and secants / by John Seller. Source: Wellcome Collection.
16/532 page 2
![The Englifl Pilot; and Sea= Atlas. defcribing~ the Sea- Coatts, Capes, Soundings, Sands, Rocks, and Dangers; the Bays; Roads, Harbors, Rivers, and Ports, in moft of the known Parts of the World : Being fur. nifhed'with new and exact Draughts and De(criptians: collectedrtrony the Experience of divers of ouriable Navizators % the like trot hererofoge publithed in England.* “' Secondly, That which may more properly bear the Name, and prin- Cipally deferves to be entituled the “rt of Navigation, is that part Which guides the Ship in her Cour through the Immenfe Ocean, to any part of the-known World > Which cannot be done, unlefs it be determin- cd in what Place the Ship is at all times, both jn refpect of Latitwde and Longitude; this being. rhe Principal Care_ of q Navigator, and the Malter-viece of Nautical Science, T° the commendable Accomnplilhment of ‘which Kaowledg, thefe four Things are fubordinate Requifites ; & Seithinesicns Crigananetry, and Che Doctrine af Che Spheres. Vike Numeration, Addition, Subtratlion, Multiplication, and Divifion. Q£ which ia Order, SEC T. I. OF NUMER 4 TION, A] C2eration teaches y Number {poken or pro- i Y when written, Purpofe:youare tg oblerve, That Numbers are commonly exprefled by thele Nine F igures, gnifies Number ; and in it there are fiye e{pecial Parts, Le <2 PHO MB Be Seg B snp Onc, Two, Threes four, Five, Six, Sevey, Eight, Nines](https://iiif.wellcomecollection.org/image/b30342399_0016.jp2/full/800%2C/0/default.jpg)
