Transactions . o 406 The Canadian Mining Institute then be coloured and the map rendered intelligible to others besidesthe draftsman. There are also other advantages. When a tracinghas to be brought up to date it may happen that some pillars^havebeen removed, drifts widened, etc. No erasures are made on thelinen but the extra lines needed are inked in and the lines notneeded are simply inked out on the negative. Another advantageis that the title, and other important lettering, has only to bemade once and traced once. On subsequent tracings it is original negative is, however, kept
Transactions . o 406 The Canadian Mining Institute then be coloured and the map rendered intelligible to others besidesthe draftsman. There are also other advantages. When a tracinghas to be brought up to date it may happen that some pillars^havebeen removed, drifts widened, etc. No erasures are made on thelinen but the extra lines needed are inked in and the lines notneeded are simply inked out on the negative. Another advantageis that the title, and other important lettering, has only to bemade once and traced once. On subsequent tracings it is original negative is, however, kept and in future negatives itis only necessary to cut a hole where required and attach the nega-tive of the title or whatever it has not been advisable to are other minor advantages which will show themselvesafter the process has been used for a little while. f^iS^^B v x ^p rHv 1 —. -J — - v- ^^ IpH^r . Fig. KIV Ore Train approaching Pocket. The incline for dumping the cars is shewn on the left. n.
Size: 1276px × 1960px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
