 ... of different grades. Turkish emery is a hard black and brown stone found in Turkey and brought to this country for use in machine shops. Its quality, for hardness and durability in mechanical work, has never been excelled in any stone yet found. The...  The Starrett Book for Machinists' Apprentices - Σελίδα 43των Howard Parker Fairfield, Carl Stephen Dow - 1917 - 184 σελίδεςΠλήρης προβολή - Σχετικά με αυτό το βιβλίο
 | Stanley Holmes Moore - 1908 - 532 σελίδες
...150, 180 and 220. The degree of smoothness of the surface which these numbers leave may be roughly compared to that left by files, as follows: 8 and 10 represent the cut of a wood rasp. 16 and 20 represent the cut of a coarse rough file. 24 and 30 represent the cut of an ordinary rough file.... | |
 | William Henry Dooley - 1919 - 482 σελίδες
...has never been excelled in any stone yet found. The cloth made is of various grades of coarseness. " The numbers representing the grades of emery run from...of a wood rasp 16 " 20 " " " " a coarse rough file 24 " 40 " " " " an ordinary rough file 36 " 40 " " " " a bastard file 46 " 60 " " " " a second-cut... | |
 | William Henry Dooley - 1919 - 498 σελίδες
...has never been excelled in any stone yet found. The cloth made is of various grades of coarseness. The numbers representing the grades of emery run from...of a wood rasp 16 " 20 " " " " a coarse rough file 24 " 40 " " " " an ordinary rough file 36 " 40 " " " " a bastard file 46 " 60 " " " " a second-cut... | |
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