. The Bell System technical journal . BT and DT slabs, the negative-figures represent good portions. The basic principle of this mstrument is as described in section Ashere used, the two optical systems (including the eye and the slab) are sodisposed as to obtain the best reflection-contrast in Test /, and the most dis- 1^ An excellent screen consists of two sheets of thin sandblasted cellulose acetate. ETCH TECHNIQUE 29 tinct portion of the etch-ligures in Test 2. That the observations are sosimilar for this 20° range of cuts indicates that the nature of the etch-pitson these cuts is ve
. The Bell System technical journal . BT and DT slabs, the negative-figures represent good portions. The basic principle of this mstrument is as described in section Ashere used, the two optical systems (including the eye and the slab) are sodisposed as to obtain the best reflection-contrast in Test /, and the most dis- 1^ An excellent screen consists of two sheets of thin sandblasted cellulose acetate. ETCH TECHNIQUE 29 tinct portion of the etch-ligures in Test 2. That the observations are sosimilar for this 20° range of cuts indicates that the nature of the etch-pitson these cuts is very similar, (see Fig. for the nature of the etch-pits onAT slabs). The angular arrangement of the Test / optical system makesuse of strongly developed facets which are approximately parallel to the X-axis and inclined at an angle of —° to the Z-axis of the quartz. Withinexperimental error these facets are parallel to the atomic planes andhence are called the facets. It is also these facets that give the enlarged.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
