The daily morning journal and courier., 1897-12-24
Continued from Tenth Page.l

pounds per square inch for lroni SheallHs stress in web 10 000 pounds per square men for steel, and 5000 pounds per square inch for iron, but no web plate shall be less thdh one-quarter of an inch in thickness hNetsd plate girders shall be proportloned upon the supposition that the bending or Hang stralns are resisted entirely by the upper aun lower hanges, and that the shearing stralhs are resisted entirely by the web-plate, NO part of the web shall be estimated as lanss area, nor more than one-half of that poruon or the angle iron which lies against the web. The distance between the centers or gravity of the tange areas shall be considered as the effective depth of the glrder. RlVets in plate girdeTs shal not be less than three quarters of an inch in diameter, and shall not be spaced more than six lnches apart ln any case.
 The maximum stress per square inch of rivet area (single shear) shall not exceed the following for all kinds of riveted work, name ly:-For shop driven riVets 5000 pounds for steel and 750O pounds for iron, and for field driven rivets 7,500 pounds for steel, and 60OO pounds for iron. The maximum direct bear ing for rivets and pins shall not exceed 15O00 pounds per square inch.
 Sec. fl. Before any girder, as before men, tioned, to be used in any building, shall be so used, the architect or the manufacturer of or contractor for it shall, if required so to do by the Inspector of Buildings, submit for his examination and approval diagram show ing the loads to be carried by said girder, and the strains produced by such load, and RlSO SnoWln& the QllnenSOnS or the udleridIS of which said girder is to be constructed to provide for the said strains; and the manu- facturer or contractor shall cause to be mark ed ll said glrder in conspicuous place, the wegnt said girder will sustain. and no greater weight than that marked on such glrder snail beam, lintel or girder intended to span au opening over ten feet in length in any build ing, shall be used for supporting wall, the manufacturer or founder thereof, or the owner of said building, shall have the said beam, lintel or grder inspected. In case any iron or steel beam, girder or linte, or any iron or steel column, shall be rejected py sac Inspector as unfit or insufficient to be used for the purpose proposed the same snail not be used for such purpose in Or upon or about any building or part thereof, All iron work or steel work used ip any building snail be of the best material and made in the best manner, and properly painted with oXloe ot iron and linseed oil paint before being placed in position, or coated with some other equally good preparation, or suitably treated, for preservation against rust
 Sec 42. All wooden beams or other timbers in the party walls of every building built of stone, brick or iron, shall be separated rom the beam or timber entering In the opposite side of the wall by at least four inches Of solid mason work. No wooden floor beams nor wooden roof beams used in any building, exceeding three stories in height, hereafter erected, shall be of a less thickness than three inches All wooden trimmer and header beams shall not be less than one inch thicker than
 
 the header is four feet or less in length; and where the header is more than four feet and not more than fifteen feet in length, the trim mer and header beams shall be at least double
 the thickness of the floor or roof beams or shall each be made of two beams form ing such thickness properly spiked or hoited together, and when the header is more than fifteen feet in length wrought-iron fitch plates of proper thickness and depth shall be placed between two wooden beams suitably bolted together to and through the iron plates in constructing the trimmer and header beams; or wrought-iron or rolled steel beams of sufficient strength may be used. Every wooden beam, except header and tail beams, shall rest at one end four inches in the wall, or upon a girder as authorized by this title. All wooden floor and wooden roof beams shall be properly bridged with cross-bridging and the distance between bridging or between bridging and walls shall not exceed eight feet. Every wooden header or trimmer more than four feet long,, used in any building, shall be hung in stirrup-irons of suitable thickness for the size of the timbers or joist hangers approved by the Inspector of Buildings. No timber shall be used in any wall of any build ing where stone brick os iron is commonly used, except 1intels, as herenbefore provided. The ends of all wooden floor and roof beams where they rest on brick walls, shall be cut to beyel of three inches on their depth, so that in case of fire they may fall without injury to the walls, All wooden beams shall be trimmed away from the fues, whether the same be a smoke air or any other fue, the trimmer beam to be eight inches from the inside face of a tiue in 8 straight way and four inches from the outside of chimney breast, and the header two inches from the outside face of the fue. All ireplaces shall have trimmer arches to support hearths, and the said arches shall be at least sixteen inches in width, measured from the face of the chim- uey breast, and at least ono foot longer on each side than the width of the fireplace open- ing, and they shall be constructed of brick, stone or burnt-clay. Wooden centering under Il, cla11 LoFo, plastering the ceiling underneath. Each tier of beams shall be anchored to the side, front, rear or party walls at intervals of not more than six feet apart, with good, strong wrought-iron anchors of not less than one and a half inches by three-eighths of an inch in size, well fastened to the side of the beams by two or more nails made of wrought iron at least one-fourth Of an inch in diam- eter. The ends of beams resting upon girders shall be butted together, end to end, and strap ped by. wrought-iron straps of the same size and distance apart and in the same beam as the wall anchors, and shall be fastened in the same manner as said wall anchors, or they may lap each other at least twelve inches and be well spiked or bolted together where Iapped. Where the beams are supported by girders, the girders shall be anchored to tine walls and fastened to each other by suitable iron straps. Every pier and wall, front or rear shall be we'll anchored to the beams of each story with the same size anchors as are required for side walls which anchor shall hook over the second beam. Each tier of beams front and rear, opposite each pier, shall have hard wood or Georgia pine anchor strips dove-taied into the beams diagonally, which strips shall cover at least four beams, and be one inch thick and four inches wide, but no such anchor strips shall be let in with. in four feet of the center line of tre beams or wooden strips shall be nailed on the top of the beams and kept in place until the floors are being laid. Wooden columns supporting wooden girders and wooden floor beams and wooden roof beams. in all buildings more than two stories in height, shall each have cap and base plates of iron not less than one inch thick, and of proper size and shape. Said wooden columns, when placed one over another shall not bear upon any wooden girder, but shall bear directly upon each suitable iron dowels passing through the eiruers All timbers and wood beams used in any building shall be of good, sound ma terial free from rot, large and loose knots, shakes, or any imperfecton whereby the strength may be impaired, and be of such size and dimensions as the purposes for which the building is intended require.
 Sec 43. All chimneys shall be built of brick, stone or other inenmbustible materials.
 Chimneys in all buildings shall have walls at least eight inches thick, if of brick, unless terra cotta or tire-clay fue Things are used, in which case four inches of brick work may be omitted. Chimueys other than those built of brick shall have walls at least eight inches thick and shall, have an additional lining of four inches of brick work or terra cotte or fre-clay lining. Said fue lining shall start from the bottom of the fue, or from the throat of the fireplace If the fue starts from the latter and shall be carried up continuously to the extreme height of the fue. The joints