66

APPENDIX L— Continued.

28. Analyses shall be made by the manufacturer of every melt, showingamount of phosphorus, carbon, silicon and manganese, and certified copies ofthese analyses shall be furnished to the mill inspector, who will forward themto the Chief Engineer.

29. Weekly reports in full detail, including reports of chemical analyses,shall be sent to the Chief Engineer at his Chicago office not later than the endof the week succeeding the week in which such tests are made.

30. Three notices of the shipment of manufactured material identifying themelts and dimensions shall be mailed on the day after such shipments aremade, in the same manner as the notices of acceptance of material.

31. Every finished piece of steel shall be stamped on one side near themiddle of the bar and also on both ends of the bar with a number identifyingthe melt.

32. The finished product shall be perfect in all parts and free from irregu-larities and surface imperfections of all kinds. *'

"I 0 33. The cross sections shall never differ more than two’per cent from the

ordered cross sections as shown by the dimensions on the plans.

34. All sheared edges shall be planed off so that no rough or sheared

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surface shall ever be left on the metal.

35. Steel for pins shall be sound and entirely free from piping. All pinsin the main trusses shall be drilled through the axis. lL "

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CAST STEEL.

36. A sample bar 1J inches in diameter and 16 inches long shall be castfrom every melt. This sample bar shall then be turned down to three quartersof an inch in diameter and the laboratory tests made upon it.

.3.7. These laboratory tests shall show an ultimate strength of at least70 000 pounds, an elastic limit of at least 40 000 lbs., an elongation of atleast 15 per cent, in 8 inches and a reduction of 18 per cent, at point of fracture.

38. Steel castings shall be sound and as free as possible from blow holes.

39. If on the finished surface the blow holes cover more than part of

the entire surface, and if any blow hole exceeds one eighth of an inch in diam-eter, the casting shall be rejected. ' ■ 9

uhw mxolaoe unCAST IRON.

40. Cast iron shall be the best [ quality of dark gray charcoal iron of aquality ,suitable f for. car wheels,; the castings to be entirely sound and free fromblowholes. i ■ . <u L.

III. MANUFACTURE.

41. The w6tk shall be done in allfurnished by the Chief Engineer.

respects according to the detail plans

42. Where there is room for doubt as to the quality of work required bythe plans or specifications, the doubt shall be decided by using the best classof work which any interpretation would admit of.

. ' ■ 43. All workmanship, whether particularly specified or not, must be of thebest kind now in use. Past work done for the same chief engineer will neverbe recognized as a precedent for the use of other than the best kind of work.

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44. Ragged edges or any kind of irregularities or unnecessary roughnesswill be sufficient ground for rejection.

45. All surfaces in contact shall be cleaned and painted before they areput together.

46. All work shall be finished in the shop and ample time given for

inspection. • • <<-' j

47. No material shall be loaded on cars until accepted by the inspector.

48. The finishing of work after loading will not be permitted.

SOLID DRILLED WORK.

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49. All riveted members which are made of High Grade Steel and all otherpieces connecting with such members shall be solid drilled, no punching what-ever being allowed, excepting lacing bars which may be punched and reamed.

50. All plates, angles and shapes shall be carefully straightened at theshops before they are,put together. Mill, straightening will not be consideredto meet this requirement.

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51. The pieces shall be then assembled and held in position by clamps andbolts. .

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52. Where bolts passing through the metal are used, the holes shall bedrilled in all metal more than three quarters of an inch thick, the diameter ofthe drilled hole to be at least one eighth of an inch less than the diameter ofthe finished hole.

53. In metal not more than three quarters of an inch thick punched holes

may be used for fitting up, the diameter of the punched hole not to be morethan three quarters the diameter of the finished hole, and the number ofpunched holes never to exceed eight in any one plate or four in one flange ofany one angle.

54. After assembling, the work shall be drilled, the rivet holes being care-fully spaced in truly straight lines and at the exact distances shown on theplans.

55. After the drilling is completed a special reamer shall be run over both

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

least J ¥ of an inch under each rivet head.

56. The assembled parts shall then be riveted up without taking apart,unless specially directed by the Chief Engineer.

57. In general, all holes which are to pass through several thicknesses ofmetal shall be drilled with all those pieces of metal assembled in the exactrelative position they are to hold in the bridge.

58. In the case of connections between members having four webs, one

member may be finished complete with the splice plates riveted on. The twoinside webs of the adjoining member, one end being already faced, may then befitted up separately in their true position and the rivet holes in the splicesdrilled. These inside webs may then be removed; the member to which theybelong shall be assembled, riveted up complete and the ends faced, the facingto agree exactly with the two ends already faced. (See § 67.) The membershall then be fitted to the adjoining member and the rivet holes in the splicesconnecting the outside webs shall be drilled. , .

59. The size of rivets shown on the plans is the size of the cold rivet beforeheating.

60. The diameter of the finished hole shall not be more, than ^ of an inch

greater than the diameter of the cold rivet, It is intended that the heated rivetshall not drop into the hole, but require a blow from a hammer to force it in.If it is found that rivets will drop £ easily into the. holes, the inspector will con-demn those rivets and order a larger size. r ... .Oi Oq- ■■{■f/

61. In all cases where riveting is to be done in the field, the parts so to berivetedshall.be fitted together in the shops and the rivet holes drilled whilethey are so assembled.

62. The riveted connections of the portals, cross frames and floor beams

with the posts and chords shall be drilled with the several parts fitted together,excepting in the case of interchangeable floor beams. i

63. An iron templet not less than two inches thick may be used instead ofthe floor beams ( wlien drilling the holes in the chords, and the same templetinstead of the chords when drilling the holes in the floor beams; a templet maybe used in the same manner in drilling the connections between the floor beamand the supported upright at panel points where two inclined members cometogether; but the connection between the floor beam and the vertical sus-penders at panels point L„ and L, of the intermediate spans shall be drilledwith the parts actually assembled and marked. With this arrangement twofloor beams at each end of the intermediate spans, making eight in all,become special; the other floor beams are classed as interchangeable.

64. All rivets shall be driven by power wherever this is possible,

65. All rivets shall be regular in shape, with hemispherical heads concen-tric with the axis and absolutely tight. Tightening by calking or recuppingwill not be allowed. This applies to both power driven and hand driven rivets.

66. All pin holes and holes for turned bolts passing through the wholewidth of a riveted member shall be bored or drilled after all other work iscompleted.

67. All surfaces in contact shall be carefully faced, the facing to be doneafter the entire member is assembled and riveted up, except that in the case ofchord sections with four webs, the inside webs may have one end faced beforethey are assembled, these two faced ends to be carefully held against a planesurface when assembled and the corresponding ends of the other two webs tobe faced after riveting and to agree with the ends already faced.