44 



STEEL ROOF TRUSSES AND MILL BUILDINGS. 



CHAP. I. 



9kukl'0" 

 r 



SECTION A-A 



LOU WES 



Maximum length unsupported 7 f O" 

 Use tt- -?? U'S- Gage un/ess specified* 

 Order 5heets //"wide and a/Sow ? "enj fsp . 

 Punch ~f ho/es in steel work, sr?d bifl 

 ^ ' diameter x / long round head store bolts* 





FIG. 35. DETAILS OF A STEEL MONITOR LOUVRE VENTILATOR. 

 AMERICAN BRIDGE COMPANY. 



" Sandwich " doors are made by 'covering a wooden frame with flat or corrugated steel. 

 The wooden framework of these doors is commonly made of two or more thicknesses of | in. 

 dressed and matched white pine sheathing not over 4 in. wide, laid diagonally and nailed with 

 clinch nails. Care must be used in handling sandwich doors made as above or they will warp 

 out of shape. Corrugated steel with I J in. corrugations makes the neatest covering for sandwich 

 doors. 



For swing doors use hinges about as follows: For doors 3 ft. X 6 ft. or less use 10 in. strap or 

 10 in. T-hinges; for doors 3 ft. X 6 ft. to 3 ft. X 8 ft. use 16 in. strap or 16 in. T-hinges; for doors 

 3 ft. X 8 ft. to 4 ft. X 10 ft. use 24 in. strap hinges. 



STEEL DOORS. Details of a steel sliding door are shown in Fig. 37. Details of a swing- 

 ing steel door are shown in Fig. 38. Steel doors should be covered with corrugated steel-, prefer- 

 ably with I y in. corrugations. 



Details of the track for a sliding door are shown in Fig. 39. 



EXAMPLES OF STEEL MILL BUILDINGS. The following examples will illustrate the 

 practice in the design of steel mill buildings. 



Example of Ketchum's Modified Saw Tooth Roof. The modified form of saw tooth 

 roof shown in (n) Fig. 6, was proposed by the author in the first edition of " The Design 

 of Steel Mill Buildings " (1903). This form of saw tooth roof has been used in the paint 

 shops of the Plank Road Shops of the Public Service Corporation of New Jersey, Newark, N. J. 



