Heat treating and inspection of metals Page: 39
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HEAT TREATING AND INSPECTION OF METALS
b. The machine (fig. 6) consists principally of a base, or standard,
elevating screw, anvil, penetrator, device for applying the load, and
3 7 1
Penetrator. 7. Gage sleeve.
Weight pan. 8. Indicating gage dial.
Anvil. 9. Crank handle.
Elevating screw. 10. Plunger rod.
Hand wheel. 11. Major load.
Indicating gage stem.
FIGURE 6.-Rockwell hardness tester.
(1) The dial indicator is provided with two scales. The black or
C scale and the red or B scale. The C scale is used when testing with
the diamond cone and 150 kilogram load while the B scale is used in
connection with the steel-ball penetrator and 100 kilogram load.
Readings, when recorded, must be prefixed by the letter B or C to show
which scale has been used and a column is provided for each scale in
table VII. When the readings fall below the table value, C-20 (B-98),
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United States. War Department. Heat treating and inspection of metals, book, September 10, 1941; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc96657/m1/41/: accessed April 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.