The compleat surveyor containing the whole art of surveying of land by the plain table, theodolite, circumferentor, and peractor ... : together with the taking of all manner of heights and distances, either by William Leybourn.

CHAP. XXII. How to take the Plot of a field at one station taken in any angle thereof, from which all the rest may be seen, by the Circumferentor.

PLace your Instrument at H, and direct the sights to A (observing the cautions formerly delivered in the use of this Instrument) the Needle cutting 22 degrees 15 min. and the distance HA containing 8 Chains 46 Links, which agrees exactly with the first observation in the last Chapter: these degrees and minutes, together with the measured distance HA, must be noted down in the severall Columns of your Field-book, and if you make observation round about the field, from angle to angle, and measure the length of every line from H, to B C D E F and G, you shall finde the degrees cut by the Needle, to be the same with those (in the last Chapter) cut by the Index, and the measured di∣stances to be likewise equall: and if you make a Table of your ob∣servations, you shall finde it the same with that in the last Chapter.