One wooden brace and two iron braces are to be put in, as shown upon the plan hereto annexed.  The wooden brace is to be of one piece, or of two pieces well bolted together, of selected lumber, free from knots and other imperfections, squared, and measuring 6 by 8 inches in cross section.  The iron braces are to be of 1 inch diameter, best quality wrought-iron rods.  The bearing plates, four to each rod, are to be not less than 10 inches in diameter, of sufficient strength, and securely and permanently fastened to the braces.

5.  WIRE FENCING

Such area as may be determined is to be fenced with the best quality of galvanized iron barbed wire, strung upon posts placed 20 feet apart.  The posts are to be of mesquite, not less than 3 inches in diameter and of a reasonable degree of straightness (not varying more than 5 inches from a straight line).  The posts are to be at least 6 feet 6 inches long and are to be planted perpendicularly with 4 feet 6 inches clear and at least 2 feet below the ground surface.  Three lines of double wire are to be stretched upon and securely fastened to the posts, the first at a distance of 2 feet from the ground, the second at 3 feet, and the third at 4 feet from the ground.  Two gateways are to be provided, at such points as may be directed, the side posts to be of squared timber, 6 by 6 inches in cross section, and the gates to be made of sawed lumber 1 inch by 5 inches, hung upon good iron hinges, and leaving a clear space of not less than 12 feet when open, the whole to be executed in the best and most workmanlike manner.

6.  ROOF

The building is to be crowned by a roof of corrugated iron, supported in the manner shown in the accompanying plan and sections.  The uprights are to be of selected squared lumber 1 foot square, each in a single piece, the lower ends planted at least 3 feet below the original ground level, and to be braced and tied to each other, as shown in the plan.  The tie pieces are to be of selected squared lumber, 4 inches by 6 inches in cross section.  The roof is to be framed and braced in the ordinary manner, and this framing is to extend beyond the outer wall 6 feet.  The covering is to be a good quality of corrugated iron roofing, securely fastened to the framework, and painted with three good coats of the best quality of roof paint.  The whole to be constructed and executed, in the best and most workmanlike manner, of good materials throughout, and to be of a strength sufficient to withstand the windstorms to which it may be subjected.

III.  PLANS AND SECTIONS—­PRESERVATION OF THE CASA GRANDE RUIN, ARIZONA.  SCALE OF ALL THE PLANS AND SECTIONS. 0.1 INCH = 1 FOOT

Plans and sections accompanying specifications are as follows: 

  Plan showing tie-rods, limits of work, and lines of ground sections.
    [Plate CXVII of this report.]

  Three east-and-west sections to show estimated amount of excavation
    necessary. [Plate CXVIII of this report.]