The daily morning journal and courier., 1897-12-23
tContlnued from Tenth Page.)


 stress in web 10000 pounds per square inch for steel, and 5000 pounds per square men for iron, but no web plate shall be less than one-quarter of an Inch in thickness RlVeted plate girders shall be proportioned upon the supposition that the bending or Hang strains are resisted entirely by the upper ana lower tlanges, and that the shearing strains are resisted entirely by the web-plate. No part of the web shall be estimated as hange area, nor more than one-half of that portion of the angle iron which lies against the web. The distance between the centers or gravity of the lange areas shall be considered as the effective depth of the girder. Rivets in plate girders shal not be less than three quarters of an inch in diameter, and shall not be spaced more than SIX inches apart in 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 7,500 pounds for iron, and for field driven rvets 7,500 pounds for steel and 5000 pounds for Iron. The maximum direct bear ing for rivets and pins shall not exceed 150O0 pounds per square inch.
 Sec. A.. Before any girder as before mem toned, 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 also showing the dimensions of the materials of which said grder is to be constructed to provide for the said strains; and the manu- facturer or contractor shall cause to be mark ed up said girder in conspicuous place, the weight said girder will sustain and no greater weight than that marked on such girder shall beam, Intel or girder intended to span an 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 girder inspected. In case any iron or steel beam. girder or lntel, or any iron or steel column, shall be rejected by said Inspector as unfit or insufficient to be used for the purpose proposed, the same shall not be used for such purpose In Or upon or about any building or part thereof. All iron work or steel work used in any building shall be of the best material and made in the best manner, and properly painted with oxide of 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 from 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 less thickness than three inches. All wooden trimmer and header beams shall not be less than one inch thicker than the floor or roof beams on the same tier, where 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 bolted 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 n c1Ifr hn 1Jc wooden beam, except header and tail beams, shall rest at one end four inches in the wall, or upon 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 or iron is commonly used except lintels, as hereinbefore provided. The ends of all wooden floor and roof beams where they rest on brick walls, shall be cut to a bevel 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 f1ues, whether the same be, a smoke, air or any other fue, the trimmer beam to be eight inches from the inside face of fiue in straight way and four inches from the outside of a chimney breast, and the header two inches from the outside face of the f1ue. All freplaces 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- ney breast, and at least one 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 trimmer arches shall be removed before clustering the ceiling underneath. Each tier of beams shall be anchored to the side, front ar Is Of moi 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 lapped. Where the beams are supported by girders, the girders shall be anchored to the walls and fastened to each other by suitable iron straps. Every pier and wall, front or rear shall be well 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-tailed 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 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 other or shall have between the iron plates suitable iron dowels passing through the girders. 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 imperfection 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 incombustble materials.
 Chimneys in all buildings shall have walls at least eight inches thick, if of brick unless terra cotta or fire-clay flue Things are used, in which case four inches of brick work may be omitted. Chimneys 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 a terra cotta or fire-clay lining. Said flue lining shall start from the bottom of the fiue, or from the throat of the fireplace If the iue starts from the .baIl ba rod Tptyp ,,cl,y