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£99 Additions and Correttions

Gate-Pofts.—Thefe(hould“be ofa fufficient length and firength; and being fixed

about eight feet nine inches afunder will be adapted for a gate nine feet long, or

nine feet two inches including the thimbles: the thimbles being attached to the

gate in the manner above direéted, let the gate be fupported where it is to hang and

faften, and then drive in the upper hook at a convenient diftance from the ed e of p) i

t| hanging-poft, fo that the upper hinee fhall not be in the way of any carriage

Nn oe ling the road, but at the fame time fo near to the edge of the poft as to lofe no.

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more room for the road than is unavoidable, by the head and heel of the gate ex- 3 J

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tending a little upon the two pofts. It is not neceflary to the gate that it fhould lap againft the hanging-poft at all; but fince the head ought to meet the falling- poft, at leaft with half its own fabflance, or from that to two inches, the hanging- poft fhould be nearly as much: covered by the heel for the fake of uniformity. When the upper hinge is fitted, the gate ought to be fupported upright, for afcer- taining’the place of the lower hook; and if the thimbles are properly put on, the pofition of the lower hook cannot be mifiaken. Both hinges being fitted, it re- mains to be found whether the hooks are in their exact places; for this purpofe take two plumbed lines, with fine threads and heavy even-fided plumbs; if the hooks are well finithed, the obfervation refpeCting their centres may be taken by faftening the plumbed lines round the hooks, and letting them fall from the outfides of fimilar parts of the hooks; forty inches being the given diftance of the hinges, the hori- zontal diftance of the two lines falling from the hooks fhould be 14 inch, and in a line which forms an angle of 22° 30%, with the gate’s line of faftening: take, there- fore, acommon two-feet rule, and, having opened the legs to the angle of 22° 30%, place one fide of it againft the plumbed lines, which ought to anfwer to the meafure of 12 inch, while the other leg of the rule fhould be parallel to the gate’s line of faftening; a flight blow or two with a hammer on one or both of the hooks, in the direCtion neceflary, will complete the adjuftment; and the gate will be found to fhut of itfelf from any line within 135° from its fafiening, and without violence, whether opened to the fmalleft, the greateft, or any intermediate angle: prefcribed by the fhort poft, which fhould be placed to meet the middle part of the gate at the angle of about 133° from the line of faftening*.” And“it might be prudent, before the{hort poft were put down, to afcertain at what line the gate will ftand open, or be poifed by the friCtion of its hinges towards the line of equilibrium, which will difcover how near the workmen

may have adjufted the line of faftening to 22° 30’ fhort of the natural line of refk;

* Parker's Effay on Gates. 7 5