68
112. The side bars connecting the rod's shall be dnlied to fit the rods with
a play not exceeding ^ of an inch, and the upper and lower surfaces of theseside bars shall be planed. i il! 1 ■' ,i;
113. The lower side bar in each instance shall be fitted with a graduatedbronze scale, so divided as to register inches of motion of the top bearing' andthe upper bar shall be fitted with a German silver vernier, so divided as toread to sixteenths of inches as graduated on the scale.
114. The two bearings, including everything between the masonry and the
fourteen inch pin, shall be set up complete in a level position at the Athens'shops and shall not be shipped before they have been examined and approvedby the Chief Engineer. They shall * be ready for his inspection on or beforeJanuary 1, 1891. ' u.
115. Special pains shall be taken with the slip joints at the suspended
ends of the intermediate spans; the surface of the joints shall be polished and;fitted exactly. , e Sl dl£0 ii0
MISCELLANEOUS.
116. All material shall be cleaned, and, if necessary, scraped and givenone heavy coat of Cleveland iron-clad paint, purple brand, put on with boiledlinseed oil, before shipment. This applies to everything except machine fin-ished surfaces.
117. The same paint shall be used wherever painting is required.
118. All machine surfaces shall be cleaned, oiled and given a heavy coat ofwhite lead and tallow before shipment. The inspector must see that this is a sub-stantial coat, such as is used on machinery, and not a merely nominal covering.
119. All small bolts, all pins less than six inches in diameter, the expan-sion rollers and everything with special work on it, shall be carefully boxedbefore shipment.
120. The contractor will be required to furnish the field rivets for erection,furnishing 20 per cent, in excess of each size over and above the number actu-ally required, but this excess will not be estimated, but considered as takingthe place of the work which is not done on these rivets.
IV. INSPECTION.
121. The mill inspection shall be performed at the expense of the con-tractor, by an inspector accepted by the Chief Engineer.
122. This inspector will be required to furnish the certificates and noticesin the manner specified above.
123. The mill inspector shall from time to time check the manufacturers’analyses by analyses made by an independent chemist.
124. The acceptance of material by such inspector will not be consideredfinal, but the right is reserved to reject material which may prove defective orobjectionable at any time before the completion of the contract,
* ’ 125. Th'einspeCtidn'a't fM ; shojrs Will be under Ui^e charge of an mspe'ctorappointed by the Chief Engineer/with 1 such assistants as may be required. °
126. Such inspector will be considered at'all times tlie'representative (ifthe Chief Engineer, and his instructions shall be followed lh the same manlieras" if given 1 by the- Chief Engineer.
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i ; h - TESTS OF FULL-SIZED BARS. , u
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127. The tests of full-sized eye bars shall be made in the large testingmachine at Athens. r
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128. These bars will be reauired to develop an average stretch of twelve
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per cent, and a minimum stretch of ten per cent, before breaking. The elonga-
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ton shall be measured on a length of not less than twenty feet, including thefracture.
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129. The bars will be required to break in the body. , ;
130. They shall also show an elastic limit of not less than 32 000 lbs. and
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an ultimate strength of not less than 62 000 lbs., as indicated by the registeringgauges of the testing machine at Athens.
131. In the case of bars too^long for the machine, the bars shall be cut in
two, each half reheaded, and both halves tested in the machine, the two tests,
however, to count as a single test bar.
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132. If the capacity of the machine (estimated at 1 200 000 lbs.) is reachedbefore the bar is broken, the bar shall be taken out of the machine and theedges shall be planed off for a length of 10 feet at the center until the sectionis reduced to the equivalent of 16 square inches of section of the original bar.Tlie bar shall then be placed in tlie^machine and broken; when this is donethe elongation shall be measured on a length of eight feet and an ultimatestrength of 60 000 lbs. computed on the 16 inches of original section will beconsidered satisfactory.
133. In these tests, a failure to meet the required elongation will be con-sidered fatal and be a sufficient cause for condemning the bars represented bythe bars so tested, but the Chief Engineer shall examine carefully into thecause of the breakage of any bar which does not meet the requirements andmay order additional tests if he sees fit.
134. The failure of a bar to break in the body shall hot be considered suffi-cient reason for rejection) provided the required elongation is obtained and notmore than one quarter of the bars break in the head.
135. In all requirements and tests the qualities given are minimum ormaximum requirements and not averages unless expressly so stated.
V. TERMS.
136. The work will be paid by the pound of finished work loaded on carsat Buffalo,
137. On riveted work and other material shipped from ^tliehs)'the differ-ence between the freight rates frohi Athens to Memphis and from Buffalo to'Memphis will be home by the contractor! Ll ‘ ,l ‘
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138. No J material will be paid for Which does hot form a part of tHe finishedsuperstructure. .ai oil ' ° .->.n anox.--
139! All expenses of testing shall be borne by’the contractor.
140. All riveted work shall be ni’ahufkctured at the Athens shop, unless tryspecial permission of the Chief Engineer. ' l - •-.>h , 0 »/>• ■ d
f l ir 141. trices' will be per pound at separate hates for High-Grade Steel andfor Medium Steel. " 1,i!
i> 242. To avoid complications, all members the principal pair'ts’of Which areHigh Grade Steel shall be estimated as wholly of High Grade Steel, ’and allmembers the principal parts'-of which are of Medium Steel shall be estihiatedas wholly of Medium Steel. 1 ; .
143. - Cas4 Steel shall be estimated as High Grade Steel'. 1 ni 111 1 ^
144. Cast and wrought iron shall be estimated at the same price as Medium
Steel) . . os-.
145. The anchorage span, the east can tile veh armband one half the east in?termediate span shall be completed and shipped oh or before October 1st, 1896.
146. The Deck Span shall be completed and shipped on or before Decem-ber 1st) 1890.
147. The central span and tlie two adjoining cantilever arms shall lie'shipped complete on or before June 1, 1891.
148. The west intermediate span and the second half of the east inter-mediate span shall be shipped complete on or before August 1st, 1891.
149. Approximate estimates shall be made at the end of each month of thematerial received and work performed up to that time.
150. In these estimates material received at the shops but not manufacturedshall be estimated at 65 per cent of the contract price for finished material.
151. Material manufactured but not shipped shall be estimated at 85 percent of the contract price.
152. Material completed and shipped shall be estimated at the full con-tract price.
153. Payments shall be made on these estimates on or about the middle ofthe following month, deducting therefrom 10 per cent., which shall be held assecurity until the completion of the entire contract.
154. In these monthly estimates no material will be estimated as receivedat the shop more than six months before the date set for the completion andshipment of such material.
155. In these monthly estimates no material will be estimated as manufact-ured more than four months before the date set for the completion and ship-ment of such material.
156. The contractors will be required to keep the material at their shopsinsured from injury by fire to the full amount of the payments mad5 off such'material 1 by the Bridge Company.