SPECIFICATIONS. 217 



at i In- works where the eye-bars arc made, if satisfactory to the engineer, but the manufacturer 



sli.ill Kii.uMiit.-r tin- liars to break in tin- body when tested to rupture. 1 he tin. knew of head 

 and in-rk shall not vary more than iVin. from that specified. (See 163.) 



1.^7. Boring Eye-Bars. Before boring, earh eye-bar shall In- proj>erly anm-aled and carefully 



Mi.iijitened. 1'in-holes shall be in the renter line of bars and in tin- o-nter of head*. Ban of 



in- length -^lull be bored so accurately that, when placed together, pins A-in. smaller in 



dianu-tiT than the pin-holes can be passed through the holes at both ends of the bars at the tame 



tiiiu- without forcing. 



138. Pin-Holes. Pin-holes shall be bored true to gages, smooth and straight; at right angles 

 to tin- a\i-> of tin- nii-inbiT and parallel to each other, unless otherwise called for. The boring 

 shall bo done alter (hi- memU-r is riveted up. 



139. The distance center to center of pin-holes shall be correct within ^y-in., and the dianu-ter 

 of the holes not more than sVin. larger than that of the pin, for pins up to 5-in. diameter, and ^- 

 in. for larger pins. 



140. Pins and Rollers. Pins and rollers shall be accurately turned to gages and shall be 

 straight and smooth and entirely free from flaws. 



1.4.1. Screw Threads. Screw threads shall make tight fits in the nuts and shall be U. S. 

 standard, except above the diameter of if in., when they shall be made with six threads per inch. 



142. Annealing. Steel, except in minor details, which has been partially heated, shall be 

 properly annealed. 



143. Steel Castings. Steel castings shall be free from large or injurious blowholes and shall 

 be annealed. 



144. Welds. Welds in steel will not be allowed. 



145. Bed Plates. Expansion bed plates shall be planed true and smooth. Cast wall plates 

 shall be planed top and bottom. The finishing cut of the planing tool shall be fine and correspond 

 with the direction of expansion. 



146. Pilot Nuts. Pilot and driving nuts shall be furnished for each size of pin, in such 

 numbers as may be ordered. 



147. Field Rivets. Field rivets shall be furnished to the amount of 15 per cent plus ten rivets 

 in excess of the nominal number required for each size. 



148. Shipping Details. Pins, nuts, bolts, rivets and other small details shall be boxed or 

 crated. 



149. Weight. The scale weight of every piece and box shall be marked on it in plain figures. 



150. Finished Weight. Payment for pound price contracts shall be by scale weight. No 

 allowance over 2 per cent of the total weight of the structure as computed from the plans will be 

 allowed for excess weight. 



VIII. SHOP PAINTING. 



*I5I. Cleaning. Steel work, before leaving the shop, shall be thoroughly cleaned and given 

 one good coating of pure linseed oil, or such paint as may be called for, well worked into all joints 

 and open spaces. 



152. Contact Surfaces. In riveted work, the surfaces coming in co/itact shall each be painted 

 before being riveted together. 



.153. Inaccessible Surfaces. rPieces and parts which are not accessible for painting after 

 erection, including tops of stringers, eye-bar heads, ends of posts and chords, etc., shall have an 

 additional coat of paint before leaving the shop. 



154. Condition of Surfaces. Painting shall be done only when the surface of the metal 

 is perfectly dry. It shall not be done in wet or freezing weather, unless protected under cover. 



155. Machine-Finished Surfaces. Machine-finished surfaces shall be coated with white 

 lead and tallow before shipment or before being put out into the open air. 



IX. INSPECTION AND TESTING AT THE SHOPS. 



156. Facilities for Inspection. The manufacturer shall furnish all facilities for inspecting 

 and testing the weight and quality of workmanship at the shop where material is manufactured. 

 He shall furnish a suitable testing machine for testing full-sized members, if required. 



157. Starting Work. The purchaser shall be notified well in advance of the start of the work 

 in the shop, in order that he may have an inspector on hand to inspect material and workmanship. 



158. Access to Shop. When an inspector is furnished by the purchaser, he shall have full 

 access, at all times, to all parts of the shop where material under his inspection is being manu- 

 factured. 



159. Accepting Material. The inspector shall stamp each piece accepted with a private mark. 

 Any piece not so marked may be rejected at any time and at any stage of the work. If the m- 



* See Addendum, clause (b). 



