We present in the following designs, several illustrations of the principle of the truss applied to wooden gates. It was described by us, several years ago in the Country Gentleman.

Since then, in our professional rambles, we have accidentally noticed some thirty gates erected after these designs in different sections of the country, and, for aught we know to the contrary, it is one of the most popular gates that swing. The principle of this gate is best shown in figure 80, and consists of four panels of braces crossing each other, and held firmly in position by five iron rods, which can be tightened by the screws at the bottom. The braces are not tenoned, and there are no nails about the gate. There can be no sagging under any circumstances; but should such a thing occur from unequal shrinkage, it can easily be remedied by placing a thin strip of wood or sheet lead under the foot of the braces running forward. There is economy in the construction of these gates, as they can be made with a less number of joints, and greater strength and stiffness secured with lighter materials, than in any other style of gate we know of. The principle is the one used in railroad bridges and roofs of great span, and our own experience with them, having built and tested all the gates here illustrated, is, that they possess very decided merits.

Fig. 81 is the principal entrance gate to one of the finest estates on the Hudson, above Tarrytown, and although similar in appearance to figure 82, has some very decided differences, the cross braces in this case reaching only to a second rail; the rods, however, pass through to the bottom; it is much more elaborate in workmanship, and the addition of a moulding on the top and bottom would increase its effect.

Fig. 84 is the entrance gate at the New Windsor, N. Y., Parsonage, and has been hanging six years without a perceptible change. The braces in this are one inch square and doubled; they are not halved, but cross each other, two one way and one the other, in the manner shown in figure 85.

There is no other mode of constructing gates in which rustic work can be made such good use of. The chief objection to all things made in the rustic manner is, that they soon fall to pieces, limbs shrink and twist, and nails do not hold; but a rustic gate held together by iron rods will remain good until the last brace has decayed.

Fig. 86 is the principal entrance gate to one of the most finely finished country seats on Newburgh Bay.

Figs. 87, 88, and 89, illustrate a novel style of hinge, peculiarly adapted to this gate, and is really stronger than any other. It requires less iron and less blacksmith work.

Fig. 87 shows the top hinge corner, and figure 88 the bottom hinge corner. The iron which secures this end of the gate, passes through both top and bottom hinge, and binds them and the gate securely together. The additional fastenings for hinge are made with carriage-bolts. Nothing but a power beyond the enormous tensile strength of iron and the compressible strength of wood, will cause the gates to yield in ordinary use.

Fig. 89 is a perspective view of the hinge, showing how it may be counter-sunk, and thus almost entirely concealed. Figs. 80, 81, 82, and 83, also show the hinge, and four different styles of stone gate piers.

Fig. 90 is intended for a farm gate. The cross rails are secured by carriage-bolts passed through them and the main braces. Each end of the gate has an iron rod only, which is made heavier than the others, and saves framing. The hinge is made by having the iron rod project beyond the bolt head and nut, and the upper end is passed into an eye, as shown in Fig. 91, which is screwed into the post; the lower end is pointed, and is placed in a stone as shown, or it may rest on solid iron of similar form to the eye. Any intelligent laborer, with an axe and auger, can, with the iron work, make these farm gates.

This principle of constructing gates admits of an infinite variety of designs; those given are merely suggestive. It admits of all classes of workmanship, from the plainest to the most elaborate, from the simplest farm gate to those required for the finished park, and in beauty, strength, and economy stands unequaled.

Fig. 92 and 93.—Plan and elevation of an entrance gate, which we have executed in oak, and presents an effective appearance.