Cyclopedia of architecture, carpentry, and building : a general reference work . ickest angle is 6 X = ; and the radius of gyra-tion for two angles placed back to back as above stated is 2. 55 — 0. 07= In case one angle is used for a member in compression, theleast rectangular radius of gyration must be used; and if two anglesare employed, placed back to back, care should be exercised to usethe least radius of gyration; and if the angles have unequal legs, thoselegs should be placed back to back, which will make the rectangularradii of gyration as nearly equal as possible. T
Cyclopedia of architecture, carpentry, and building : a general reference work . ickest angle is 6 X = ; and the radius of gyra-tion for two angles placed back to back as above stated is 2. 55 — 0. 07= In case one angle is used for a member in compression, theleast rectangular radius of gyration must be used; and if two anglesare employed, placed back to back, care should be exercised to usethe least radius of gyration; and if the angles have unequal legs, thoselegs should be placed back to back, which will make the rectangularradii of gyration as nearly equal as possible. The values of theradii of gyration will indicate whether the short legs or the long legsshould be placed together. The tables given in the Carnegie Hand-book give the radii of gyration for angles spaced at distances ^ inchand I inch apart; but since the connection plates of roof trusses areusually \ inch or f inch thick, the values of the radii of gyrationshould be given for angles spaced \ inch and f inch apart. Suchvalues are given in Table XL 266 PORCH—si-u— I -k^£Ip. DOORS TO BE 7-0 ttIGMAMD TO UriE \A/ITt-f WIMDOWS FIRST FLOOR f^LA^f HOUSE AT ST. PAUL, MINN. John T. Comes, Architect, Pittsburg, Pa. Cost of House, $7,500. For Exteriors, See Page 250.
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