MINDELEFF] SPECIFICATIONS 337 



cross section. The iron braces are to be of 1 iiicli diameter, best (luality 

 wrought- iron rods. The beariug plates, four to eauli rod, are to be not 

 less than 10 iuches in diameter, of sufficient strength, and securely and 

 permanently fastened to the braces. 



5. WIRE FENCINCx 



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 mescjuite, not less than 3 iuches 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 G iuches long 

 and are to be planted perpendiculai'ly with 4 feet G 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 scpxared timber, G by 

 6 inches in cross section, and the gates to be made of sawed lumber 1 

 inch by 5 inches, hung upon good iron binges, and leaving a clear space 

 of not less than 12 feet when open, the whole to be executed in the best 

 and most workmanlike inanner. 



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 

 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 

 G feet. The covering is to be a good quality of corrugated iron rooting, 

 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 sufiQcient to withstand the wind- 

 storms to which it may be subjected. 



III. PLANS AND SECTIONS— PRESERVATION OF THE CASA GRANDE 

 RUIN, ARIZONA. SCALE OF ALL THE PLANS AND SECTIONS. 

 O.I INCH = I 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.] 

 15 ETH 22 



