All prints made from a revised tracing should be stamped as per Fig. 228, and the alterations indicated by arrows, etc., in colored pencil; or, the stamp may be put on the tracing in the first place. Another method of indicating revisions on tracings and prints which has some advantages over the first, consists in using the same stamp as in Fig. 227, and also a stamp as shown in Fig. 229. This arrow mark is stamped on the tracing pointing to every change, and the letter mark of the revision ("A," "B," etc.) is written inside the feather. Thus every change, and the issue to which it belongs, is FIG. 227. Stamp for use on revised tracings. recorded on the tracing, and no such stamp as shown in Fig. 228 is necessary, and no marking has to be done on the blueprints. However, as these changes often do not show up very strikingly on the print, some such stamp as "Revised, Destroy Old Copies" had best be used on the revised prints also. Another advantage of the second method is that no additional letter is given to the drawing number: this suffixed letter is inadmissable under certain systems of drawing numbering, more particularly in structural steel detailing, where such sheet marks as "E1, E2, etc.," are in general use. Portions of this print affected by Revision. are indicated in Red. FIG. 228.-Stamp for use on revised FIG. 229.-Stamp for indicating revised blueprints. portions of a tracing. MISCELLANEOUS STAMPS FOR DRAWING OFFICE USE Below are given examples of rubber stamp inpressions of general use in drawing offices. Other stamps are shown elsewhere in this volume as follows: Figs. 100, (a), (b) and (c)—Approval stamps, used when approving or correcting contractor's detail drawings. Figs. 227 and 229, Revised stamps for tracings. Fig. 228, Revised stamp for blueprints. Fig. 230. A stamp for blueprints, specifications, etc., calling attention to the issuance of revised copies. THIS IS THE PROPERTY OF THE HONOLULU IRON WORKS CO., HONOLULU, T. H. subject to recall at any time and is to be used only in connection with the particular work for which it is prepared and upon the express condition that it is not to be copied, made public, or used in any way without the written authority of the HONOLULU IRON WORKS COMPANY Fig. 235. A stamp to be used on prints on which an estimate is made and which have to be returned to the owners: a precaution against additional material or requirements being called for on final prints. Figs. 241, 242 and 243 are examples of Title stamps. The last has its title made up in a small printing-press, the permanent part being the subject of a single block. Fig. 236 is an example of stamps used quite commonly to protect designs; it is of doubtful utility, however. Figs. 238 and 240 are examples of stamps used to denote the date (and hour) when blueprints, letters, etc., entered the office. Fig. 239 shows a stamp of general usefulness, as, for example, in dating issued blueprints. The other figures show stamps of general utility. CHAPTER XIII MISCELLANY ABBREVIATIONS USED IN ENGINEERING WORK A collection of abbreviations commonly (and uncommonly) used in engineering work, and such as are not generally tabulated in the wellknown engineering pocket-books is given below. 20 in. X 4 in. × 1 9/16 in. (pulley) = 20 in. diameter X 4 in. (nominal) face × 1 9/16 in. bore |