SURVEYING WITHOUT INSTRUMENTS. 10' 



VIII. 



A funple and accurate Method of Surveying on Shore, with fuch 

 Inftrumaits only as are in every one's Poffejfion. By Captain 

 J . Muktlock. From the Author. 



To Mr. NICHOLSON. 



28, Surry Place, Kent Road, 

 SIR, 1th January, 1 803. 



/iLMOST all our treatifes on nautical furveying begin with Introductory 

 the explanation and defcription of what are called the neceffary 

 infrruments, which are defcribed fo numerous, and the price 

 fo confiderable, that very few can procure them : Thus dif- 

 couraged, they abandon every idea of making plans of fuch 

 ports as they touch at, for want of what they conceive to be 

 the neceffary inftruments. 



To obviate this difficulty, and to render nautical furveying 

 more general, I have, in the annexed paper, attempted to 

 fhew the mariner how to furvey any port or place he may 

 touch at, with great accuracy, little trouble, and without any 

 expence for intlruments. Should you find this fimple method 

 delerving of a place in your valuable Journal, I lhall fee! my- 

 felf honoured by your infer ting it. 

 I am, Sir, 



Your mod obedient humble fervant, 



J. MORTLOCK. 



FIRST make an eye-fketch of the place to be furveyed, as Nautical furvey- 

 the annexed figure, numbering all the points, bays, rocks, '"§ without in- 

 fhoals, &c. Choofe two ftations, as A and B (Fig. 1, Plate V), 

 whence all the rocks, points, &c. may be feen from, and fo 

 fituated from each other, that the bearings of the points, &c. 

 as taken from A and B, (hail interfect. at angles at leaft greater 

 than 10 degrees, but the nearer 90 degrees the better. 



Having chofen the ftations, proceed to one of them as A,- 

 and place the paper intended to receive the plan horizontally 

 before you, extended by pins, or otherwife, on a board fe- 

 curely fixed, to prevent it fhifting its pofition while the bear- 

 ings are drawing. 



Stick 



