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this screw bolt a mortice is made quite through the post just even with the lower side of the washer. The screw-bolt is then put through the back side of the post, and the nut being screwed on keeps the post firm in the hollow coin.
In order to prevent the bar A from wearing the under side of the mortice, a washer (D, fig 2) of wrought or cast iron, one inch thick and somewhat wider than the mortice, with an eye therein to catch over the tendon on the bolt B. should be provided. C fig 1 represents a piece of cast iron, with a mortice, or notch left in its under side of the size of the bar A, which is placed in the face of the hollow coin surrounding the bar A, to prevent the edges and corners of the stone from chipping off where the bar projects from the wall. It should be dovetailing so that it will not be liable to fall out.
In order that the gates may be hung upon this plan, the cast iron box in the lower end of the post, must have one of its sides cut out the width and depth of the hole; this mortice must be continued through the timber on the back side of the post; likewise a notch must be made in the band which goes around the foot of the post. This must be done so that the new post may be placed vertical, at such distance from the wall as the length of the screw bolt B when it is attached to the bar A. The screw bolts must then be entered into the mortices, and the post moved horizontally into its place.
If any bracing should be deemed necessary, it should be so deposed as to prevent the gates from sagging upwards.
The principle if not the only objection which will be urged against the plan, will be its cutting the post away too much. But it is believed, there will be sufficient timber left to resist all the pressure which will eve-come upon it. The part of the
[Right Page] heel post which is cut away most is supported by the hollow groin. But if it should still be insisted that the post, about 3 feet long connected by bolts to screws, and placed opposite the mortices, would obviate this difficulty. It is ibvuiys that this plan cannot be adapted where the walls are already finished. In this case a a 3 inch hole is to be drilled from top to bottom of the wall 18 inches from the hollow coin, in the direction of the bar A, which is 600 from a right angle to the lock or in a line with the gate when half open. In this hole is to be placed a 2 inch round bar of iron the whole length. The bar it has an eye at each end; this long rod passes through the one eye, and the other goes into the hollow groin fast and is connected with the screw bolt as before. Whenever it is deemed proper to put in the bar A hole must be drilled horizontally in the middle of the hollow groin (something bar) to intersect the perpendicular hole. The cast iron piece C fig 1 cannot be dovetailed in this case, but must be secured by a key bolt through the bar A.
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Plan to prevent lock gates from rising when covered with water I. Lapham [1829-30?]
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[Printed Broadside]
OHIO CANAL South of Deer-creek Notice to Bidders
