| 释义 |
Jo block
colloq. abbrev. of Johansson block (see Johansson). Also fig.
1936H. D. Burghardt Machine Tool Operation (ed. 2) I. xi. 274 Size blocks may be used also instead of the pin gauge for spacing the holes. The most accurate of these gauges are the Johansson gauge blocks or ‘Jo-blocks’, which measure accurately in millionths of an inch. 1942F. H. Colvin Gages viii. 96 Standard measuring blocks, once known largely as ‘Jo’ blocks from the name of the first maker, Johannsen. 1957R. A. Heinlein Door into Summer (1960) ii. 41, I had known Ricky half her life and if there ever was a human being honest as a Jo block, Ricky was she. 1966G. W. Michalec Precision Gearing xi. 564 Using a very accurate input for positioning the carriage, such as master Jo-blocks.., the output can be observed and plotted. |