III. An astronomical survey for the correction and collection of the others, and
IV. A mineralogical survey.
I. Although the topographical survey of each county is referred to its court in the first instance, yet such a control is given to the Executive as places it effectively under his direction; that this control must be freely and generally exercised, I have no doubt. Nobody expects that the justices of the peace in every county are so familiar with the astronomical and geometrical principles to be employed in the execution of this work, as to be competent to decide what candidate possesses them in the highest degree, or in any degree; and indeed I think it would be reasonable, considering how much the other affairs of the State must engross of the time of the Governor and Council, for them to make it a pre-requisite for every candidate to undergo an examination by the mathematical professor of William and Mary College, or some other professional character, and to ask for a special and confidential report of the grade of qualification of each candidate examined. If one, completely qualified, can be found for every half dozen counties, it will be as much, perhaps, as can be expected.
Their office will be to survey the Rivers, Roads, and Mountains.
1. A proper division of the surveys of the Rivers between them and the general surveyor, might be to ascribe to the latter so much as is navigable, and to the former the parts not navigable, but yet sufficient for working machinery, which the law requires. On these they should note confluences, other natural and remarkable objects, towns, mills or other machines, ferries, bridges, crossings of roads, passages through mountains, mines, quarries, &c.
2. In surveying the Roads, the same objects should be noted, and every permanent stream crossing them, and these streams should be laid down according to the best information they can obtain, to their confluence with the main stream.
3. The Mountains, others than those ascribed to the general surveyor, should be laid down by their names and bases, which last will be generally designated by the circumscription of water courses and roads on both sides, without a special survey around them. Their gaps are also required to be noted.
4. On the Boundaries, the same objects should be noted. Where a boundary falls within the operations of the general surveyor, its survey by them should be dispensed with, and where it is common to two counties, it might be ascribed wholly to one, or divided between the surveyors respectively. All these surveys should be delineated on the same scale, which the law directs, I believe, (for I have omitted to bring the copy of it with me to this place,) if it has not fixed the scale. I think about half an inch to the mile would be a convenient one, because it would generally bring the map of a county within the compass of a sheet of paper. And here I would suggest what would be a great desideratum for the public, to wit, that a single sheet map of each county separately, on a scale of half an inch to the mile, be engraved and struck off. There are few housekeepers who would not wish to possess a map of their own county, many would purchase those of their circumjacent counties, and many would take one of every county, and form them into an atlas, so that I question if as many copies of each particular map would not be sold as of the general one. But these should not be made until they receive the astronomical corrections, without which they can never be brought together and joined into larger maps, at the will of the purchaser.
Their instrument should be a Circumferentor, with cross spirit levels on its face, a graduated rim, and a double index, the one fixed, the other movable, with a nonius on it. The needle should never be depended on for an angle.
II. The General Survey divides itself into two distinct operations; the one on the tide waters, the other above them.