APPENDIX Jj— CONTINUED.

68. When two chord pieces are fitted together complete in the shop thereshall be no perceptible wind in the length of the two sectipns. The chords aregenerally made in two panel lengths, or 56 feet 5£ inches long. In the case ofshorter lengths a sufficient number of pieces shall be put together to make acontinuous length equal to two of the long sections.

69. All chord sections shall be stamped at each end on the outside withletters and numbers designating the joints in accordance with the diagram planfurnished by the Chief Engineer.

70. The posts shall be fitted together for their entire length and bolted upand when so fitted shall be perfectly straight and free from wind.

71. The same rule shall apply to the marking of the posts as to themarking of the chords.

72. Pin holes shall be bored truly and at exact distances, parallel with oneanother and at exactly right angles to the axis of the member.

73. Pinholes in the posts shall, be truly parallel with one ^another and

shall be at right angles to the axis of the post^ . ,

74. Pin holes shall be bored with a sharp tool which will make a clean,

smooth cut. Two cuts shall always be taken, the finishing cut never to bemore than £ inch. Roughness in pin holes will be sufficient reason for re-jecting a whole member. r „

75. Measurements shall be made from an iron standard of the same tem-perature as the member measured.

PUNCHED AND REAMED WORK.

76. All riveted members which are composed entirely of Medium Steelmay be punched and reamed, but this does not apply to the connectionsbetween such members and High Grade Steel members, which connectionsshall be solid drilled throughout.

77. All plates, angles and shapes shall be carefully straightened at theshops before they are laid out. Mill straightening will not be held to meet thisrequirement.

78. The rivet holes shall be marked from templets and these templets shalllie flat without distortion when the marking is made.

79. The angles of stringers must be square and straight. The web platemust not project above the angles and the top surfaces of the top angles mustbe such that the outside edges are never above a true plane and never morethan one-sixteenth of an inch below a true plane coincident with the roots ofthe angles.

80. The outside angle at the root of the angles connecting the stringers

with the floor beams or the floor beams with the posts, chords or other mem-bers, shall never be less than a right angle, and the excess over a right angleshall never be greater than £ of an inch in the longer leg of the angle ; theangle shall be perfectly straight. o - !

81. In fitting these angles to stringers or floor beams they shall be so

fitted that the . exact length is measured to the root of the angle, the two rootsbeing in exactly the same plane ; the entire end of the assembled member shallthen be faced. The effect of these requirements will be to prevent any reduc-tion of area of the angle at the root by facing and to secure a true surface ofthe whole width of the connection which will require no strain in the rivets todraw the parts together.

82. After laying out with templets, the rivet holes may be punched with apunch at least of an inch smaller than the diameter of the rivets as given onthe plans and working in a die only ^ of an inch larger than the punch.

83. The several parts of the member shall then be assembled and theholes reamed so that at least ^ of an inch of metal is everywhere taken out.

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84. After the reaming is completed a special reamer shall be run over both

edges of every hole so as to remove the sharp edges and make a fillet of at

least yV °f an inch under each rivet head.

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85. The pieces shall be riveted together without taking apart.

1 86. All requirements as to size and quality of rivets and manner of rivet-ing and measuring shall be the same as the requirements for Solid Drilledriveted work. ' >ff

87. All bearing surfaces shall be truly faced.

88. All sheared edges shall be planed off and all punched holes shall bedrilled out so that none of the rough surface is ever left upon the work.

FORGED WORK.

89. The heads of eye bars shall be formed by upsetting and forging intoshape by a process acceptable to the Chief Engineer. No welds will beallowed.

90. After the working is completed the bars shall be annealed in a suitableannealing furnace by heating them to a uniform dark red heat and allowingthem to cool slowly.

91. The form of the heads of the steel eye bars may be modified by thecontractors to suit the process in use at their works, but the thickness of thehead shall not be more than ^ inch greater than that of the body of the bar,and the heads shall be of sufficient strength to break the body of the bar.

92. The heads and the enlarged ends for screws in laterals, suspenders

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and counters, shall be formed by upsetting and shall be of sufficient strength

to break the body of the bar. ..

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93. Nuts, swivels and clevises, if made of steel, shall be forged withoutwelds ; whether made of steel or wrought iron, one of each size shall be testedand be of sufficient strength to break the bars to which they are attached.

94. Eye bars shall be bored truly and at exact distances, the pin holes tobe exactly on the axis of the bar, and at exactly right angles to the plane of theflat surfaces.

95. When six bars of the same billed length are piled together the two

pins shall pass through both pin holes at the same time without driving.Every bar shall be tested for this requirement. .obffir-: ‘

„. 96. Pin holes shall be bored with a sharp tool that will make a cleansmooth cut. Two cuts shall always be taken, the finishing cut never to be.more than inch. Roughness in pin holes will be sufficient reason for, reject-ing bars. .y ■

97. Twenty full-sized steel eye bars shall be selected from time to time,from the bars made for the bridge, by the inspector for testing.

98. No bars known to be defective in any way shall be taken for test bars,but the bars shall be selected as fair average specimens of the.good bars whichwould be accepted for the work.

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MACHINE WORK.

99. All bearing surfaces shall be faced truly.

100. Chord sections and half-post sections shall be faced after they areriveted up complete, the facing to be perfectly true and square. In the case offour web chords, one end of the two inside webs only may be faced beforeriveting up.

101. The ends of the stringers and of floor beams shall be squared in afacer.

102. All surfaces so designated on the plans shall be planed.

103. All sheared edges shall be planed off, and all punched holes shall bedrilled or reamed out.

104. All pins shall be accurately turned to a gauge, and shall be of full

size throughout. ,d ' ii

105. Pin holes shall be bored to fit the pins with a play not exceeding -faof an inch. These requirements apply to lateral connections as well as to anyother pins.

106. The plans show the distances between centers of pin holes. Shopmeasurements, however, shall be made between the bearing edges of the pinholes, that is, between the inside edges of compression members and the out-side edges of tension members, with a proper allowance for the; diameter of thepin. An iron standard of the same temperature as the piece measured shallalways be used.

107. All screws shall have a truncated V thread, United States standardsizes.

108. Special pains shall be taken with the roller bearings on Pier II. Thecastings shall be accurately fitted together and when bolted up, the top surfaceshall be a perfectly true plane.

109. The rail plates shall be planed on the bottom after being riveted up,

then planed on the top and the surface polished. Any roughness or irregu-larity which prevents an uniform opening between the rail heads shall beplaned out. d moil H" ' i<\b

110. The rollers shall have the hollow sides planed and the bearing sur-faces turned to a perfectly true cylinder and polished, > f

111. The rods passing through the rollers shall fit the holes with a play

not exceeding fa of an inch. ■ -viomd