A complete treatise on practical land-surveying, in seven parts; . IV. By similar Squares. The three foregoing methods of transferring or copying plans,can only be applied, when the rough plan is of the same size Part V.) LAND-SURVEYING. 233 which you wish the finished one to be ; but as it may be ne-cessary to reduce the size of the original, this may be done bysimilar squares. EXAMPLE. Suppose the following inclosures to have been laid down bya scale of 2 chains to an inch; it is required to reduce them toone of 4 chains to an inch. f . 1 -• ;--_. : S\ : j : i : > 1 . * \ : , I : !?/ 1 :


A complete treatise on practical land-surveying, in seven parts; . IV. By similar Squares. The three foregoing methods of transferring or copying plans,can only be applied, when the rough plan is of the same size Part V.) LAND-SURVEYING. 233 which you wish the finished one to be ; but as it may be ne-cessary to reduce the size of the original, this may be done bysimilar squares. EXAMPLE. Suppose the following inclosures to have been laid down bya scale of 2 chains to an inch; it is required to reduce them toone of 4 chains to an inch. f . 1 -• ;--_. : S\ : j : i : > 1 . * \ : , I : !?/ 1 : 11 ; i (1 >^h_ ; V By a scale of 2 chains to an inch, draw the line AB = 7chains. At A and B erect the perpendiculars A D and B C,each of which make =. 6 chains; and join D C. Divide thelines A B and D C, each into 7 equal parts; and the lines A Dand B C, each into 6 equal parts; join the opposite points ofdivision, and the rectangle A B C D, will be divided into 42equal squares, the side of each being one chain. 234 LAND-SURVEYING. (Part V. H G VTr? \. XI X: ...;....)?1/ • ) E F Next, by a scale of 4 chains to an inch, draw tlie line EF^7 chains. At E and F erect the perpendiculars E H and F G,each of which make = 6 chains ; and join H G. Divide thelines E F and H G, each into 7 equal parts; and the lines E Hand F G each into 6 equal parts; join the opposite points ofdivision, and the rectangle E F G H will be divided into 42equal squares, the sides of which will be exactly half the sizeof those in the rectangle A B C D. - Then, with your pencil, draw within the rectangle E F G Hthe fences contained within the rectangle A B C D; makingeach fence pass through its proper situation in the correspondingsquares, which may be done by observing where the linesforming the squares, intersect the fences. Afterward trace thefences with Indian ink, as before directed. Note.—In copying or reducing a large plan, by this method, you oughtto number the corresponding squares, in the c


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