ERECTION PLAN 327 



pieces, leaving the templet-maker to work out the details on the laying- 

 out floor. 



The first method is illustrated in Fig. 95 and the second in 'Fig. 

 96. In the second method sufficient figures should be given to proper- 

 ly locate the main points in the truss ; the interior pieces should be lo- 

 cated by center-lines corresponding to the gage lines of the rivets, 

 the centers of gravity lines or the outside edges of the pieces, as the case 

 may be. The drawings should always indicate the number of rivets to 

 be used in each connection, the size of rivets, the usual rivet pitch, and 

 the minimum pitch allowed. 



Erection Plan. The erection plan should be made very complete. 

 All the notes that it is necessary for the erecter to have, should be put 

 on the erection plans ; how much of the structure is to be riveted and 

 how much bolted, whether it is to be painted after erection or not, 

 whether the windows and doors are to be erected or not, etc. Center 

 line drawings are usually sufficient for the erection plans. The name 

 and the size of the piece should be given and every piece should have a 

 name. 



The following method was used by the Gillette-Herzog Mfg. Co., 

 for mill buildings, and was very satisfactory: 



If the points of the compass are known, mark all pieces on the 

 north side with the letter "N", those on the south side with the letter 

 "S", etc. Mark girts N. G. I ; N. G. 2 ; etc. Mark all posts with a 

 different number, thus : N. P. I ; N. P. 2 ; etc. Mark small pieces which 

 are alike with the same mark; this would usually include everything 

 except posts, trusses and girders, but in order to follow the general 

 marking scheme, where pieces are alike on both sides of a building, 

 change the general letter; e. g. N. G. 7 would be a girt on the north 

 side and S. G. 7 the same girt on south side. Then in case the north 

 and south sides are alike, only an elevation of one side need be shown, 

 and under it a note thus: "Pieces on south side of building, in cor- 

 responding positions have the same number as on this side, but prefixed 

 by the letter "S" instead of the letter "N." Mark trusses T. i ; T. 

 2 ; etc. Mark roof pieces R. I ; R. 2 ; etc. 



