1805.] My. WaiStell's Field Gate.

Reference to the Engraving of Mr. Waistell's Gate.

DIMENSIONS. The heel of the gate to be about 3 inches ſquare. “The bead of ditto-- 2z by 3 inches. The top rail or bar--<< 35 69 15 100085. “The bottom bar-=- 34 by 14 Inches.

"The bar in the middle ofthe gate 3 by 14 inches. The other bars, and the four braces 24 by 14 inches.

Observations on its Construcl10L.

The head and heel of the gate may be of oak, and the bars and braces of fir. Narrow aud thick bars, when braced as in this design, are Stronger than broad and AE ones, containing the Same quantity of timber, and they also oppose a Tess Surface to the wind. The two points in the heel of the gate, to which the thimbles are fastened, may be considered as firm or fixed points. From these points, VIZ. 1 and 25 two braces to proceed to 4 and 3, in the middle ot the bottom and top bars, and being there Secured, these become fixed points, and from these two points, viz. 4 and 3, 1wo braces proceed to 5 and 6, fixing those points. The gate is thus doubly braced, viz. from Ihe top of thie beel to the top of the head, by means of the braces 1, 4, and 4, 5; and from the bottom ot the heel to the bottom of the head, by means of the braces 2,3, and 3, 6. On each 8ide of the gate äre two bräaces, and those parallel to each other. The brace proceeding from the bottom of the heel of the gate, and that which 15 pa- rallel to it, as also the bottom„8. are all Strained m the way of compression, and the brace proceeding from the top of the heel, and the other brace which 1s parallel to it, and also the top bar, are all strained in the way of estension. The Strains in this gate being none of them transverse, but all longitudinal, it would Support a vast weight at its head without having its form altered. The braces all Serve the double pur- Pose of keeping the gate in its true form, and of Shortening the bearings 6r be bars, and strengthening them. EE

gates have> less tumber in their braces; and perhaps in no GU: way can a gate be 80 firmly braced with 50 small a quantity of timber.

At 3, 4, 7, and 8, two braces and a bar of the gate are firmly Screwed together by means of iron pins and Screw nuts. At the other points, where only one brace crosses3 a bar, com- mon gate-nails are used.

15 8 SOme cases, a Strong top bar be wanted, to rezist t pressure of heavy cattie, a"bar or board, about SIX Inches broad, and one inch MEL may be laid with its broad zide 8DOn he top bar; and fixed thereto by means of the ends ef

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