Jo blockn.

Brit.

/ˈdʒəʊ ˌblɒk/, U.S.

/ˈdʒoʊ ˈˌblɑk/

Origin: Formed within English, by compounding. Etymons: Johansson n., block n.

Etymology: < Jo- (in Johansson n.) + block n.

Mechanics colloquial.

A Johansson block (see Johansson n.); usually in plural. Also figurative.

ΘΚΠ

the world > relative properties > measurement > measuring instrument > [noun] > for determining or verifying dimensions > for narrow gaps

wedge-micrometer1891

feeler1919

slip gauge1919

Jo block1936

1936 H. 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.

1957 R. 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.

1996 B. Anderson Porsche 911 Performance Handbk. (ed. 2) v. 177/1 We have used Jo blocks to space up the depth micrometer 0.700 inch.

2004 St. Louis (Missouri) Post-Dispatch (Nexis) 29 Apr. f2 Is there a local place that can appraise a set of Johnansson [sic] gauge blocks, also known as Jo Blocks?

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).

单词	jo block
释义	Jo blockn. Brit. /ˈdʒəʊ ˌblɒk/, U.S. /ˈdʒoʊ ˈˌblɑk/ Origin: Formed within English, by compounding. Etymons: Johansson n., block n. Etymology: < Jo- (in Johansson n.) + block n. Mechanics colloquial. A Johansson block (see Johansson n.); usually in plural. Also figurative. ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > for determining or verifying dimensions > for narrow gaps wedge-micrometer1891 feeler1919 slip gauge1919 Jo block1936 1936 H. 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. 1957 R. 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. 1996 B. Anderson Porsche 911 Performance Handbk. (ed. 2) v. 177/1 We have used Jo blocks to space up the depth micrometer 0.700 inch. 2004 St. Louis (Missouri) Post-Dispatch (Nexis) 29 Apr. f2 Is there a local place that can appraise a set of Johnansson [sic] gauge blocks, also known as Jo Blocks? This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022). < n.1936
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