To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
If a piece of Ground, or the side of a House be 100 Acres, Rods, or the like, and you measure it by a Scale of 12, and find it to be but 56 22/100, if you would know what Scale, in proportion to this, the Draft or Plot was drawn by, then work by the aforesaid Rules thus:
Find the Mean proportional Number of 100 and 56.22 thus, by ta∣king the half of them 2 Log. and the Number answering that, is the Mean proportional Number, as thus:
Now the nearest in whole Numbers is 16, which is the Scale by which the Draft or Plot was drawn.
This also you may work by Gunters Line, as is before shewed; for if you take the middle poynt between 100 and 56.22, you will find it to be neer 75; for if you set one poynt on or near 75, and extend the other to 100, that Extent will reach from 75 also to 56.22; so that 75 is the mean Proportional Number between them two.
Then if you extend your Compasses from 56.22, to 75, that Ex∣tent will reach from 12 (the supposed Scale) to 16, the true Scale: thus having shewed you several hints of this Line of Numbers, I will here shew a few more.