GUTTERS FOE EOOFS.

401

1472. In fig. 085 we show a mode of connecting corrugated arched ironplates e and c with the gutters a, which are either bolted to the cap of column b

Fig . OSj.

Fig . 6S4.

JONOTJON OP STRUTS WITH TTE-ROD—SCALE,

JONOTJON OP STRUTS WITH TTE-ROD—SCALE,J 1NCB TO TBK FOOT.

CONNECTION OF CORRUGATED IPON PLATES WITHCENTRAL 9HOK OP DOOBLB-SPah ROOF w 8CALBINCH TO THE FOOT.

or built into a wall. The plate e is secured to the side of gutter with bolts andnuts d. This figure also shows a mode of connecting the plates of adouble roof, as in fig. 643 : a the iron gutter, stretching from column tocolumn, or laid continuously in a central wall; e and c the plates, secured togutter with bolts and nuts d. The connection of outer sides of plates is thesame as at d. For roofs of large span, principals or iron trusses should be used—the principals being placed at distances varying from 10 to 15 feet, and theplates of corrugated iron slightly arched, so that, when secured to the trusses,the roof will be in longitudinal section, as a b c d, fig. 686. The upper part ofsame figure is a design by Messrs Dray & Co., London , for a wrought-iron trussfor a span of 52 to 54 feet, adapted for corrugated iron. This roof seems welladapted for covering a stackyard.

Fig . 6S6.

SKELETON TRUSS FOR CORRUGATED IRON ROOF OF 02 FEET SPAN—-SOALF., INCH TO THE FOOT.

1473. Details of Truss in fg. 686.—In fig. 687 we give the shoe b for head ofrafters at the point f in fig. 686. The rafters a a are riveted to the shoe b ; cthe snag to which the tie-rod/ h is jointed; d the plan, and e the end ele-vation of shoe. In fig. 688 we give the shoe a, to which the ends of the tie-rods k l, fig. 686, are jointed; b the snag, c c the rafter. In fig. 689 we givethe shoe e for receiving ends of tie-rods h m, fig. 686 ; d d the rafter,/the snagto which the tie-rods h m are jointed; h g is end view of shoe e. In fig. 690 ais the shoe to which the lower end of the rod from / to h, fig. 686, is jointed—it