The gentleman's steward and tenants of manors instructed. Containing rational, easy, and familiar rules and tables for finding the value of estates of freehold, copyhold, or leasehold, as well on lives as for years absolute, &c. With an enquiry into the nature of the annual disbursements, precariousness of the tenure, and casualties, that estates are charged with, and how they are to be accounted for in the valuation. The tables being founded on Dr. Halley's hypothesis, and calculated by the method laid down by Abr. de Moivre / To which is added an appendix, containing the description and use of an instrument for discovering the number of feet contained in any timber-trees, by inspection only.

  • Richards, John, land surveyor.
Date:
1730
Catalogue details

Licence: Public Domain Mark

Credit: The gentleman's steward and tenants of manors instructed. Containing rational, easy, and familiar rules and tables for finding the value of estates of freehold, copyhold, or leasehold, as well on lives as for years absolute, &c. With an enquiry into the nature of the annual disbursements, precariousness of the tenure, and casualties, that estates are charged with, and how they are to be accounted for in the valuation. The tables being founded on Dr. Halley's hypothesis, and calculated by the method laid down by Abr. de Moivre / To which is added an appendix, containing the description and use of an instrument for discovering the number of feet contained in any timber-trees, by inspection only. Source: Wellcome Collection.

    159/172 (page 123)
    ' f ‘^3 ] following Hint, as to the Foundation of them, vi^. All the Redangles arifing from the Diftance of the Vanes from each other, into the Diftance of the Objed from the Eye, are equal within themfelves; and allb equal to the Redangles made by the Breadth of the Objed into the neareft Diftance of the Eye-^ Vane from the Line that joins the Objed-^ Vanes, Tho I have order’d one of the Objed-« Vanes, for the fake of Conveniency, to be fix’d faft; yet 1 am fenfiblc that in Stridnefs it Ihould likewife move, lb that the middle of the Sliding Rule might be always in the mid-* die betwixt the two Strings * But the Error arifing on this account will be of no Confe-* quence in Pradice; for when moft, it will not be above three Minutes in the Angle at the Eye. Having thus largely delcribed the Inftfu^ ment, I flaall have the Icls Trouble in laying down the manner of ufing it to the purpol'e in hand. For after the Length of the Tree, and the Place where it muft be girt, is found by the Quadrant as before direded, and alfo the Di^ ftance of the Place from the Eye; Take the Micrometer, and having fix’d on the Eye- vane and the Grov’d-piece, let the moveable Objed-vane to the Diftance of the Objed from the Eye, as before found; and applying the Hole in the Vane to your Eye, draw the R 2 Sliding