topitn.

Brit.

/ˈtɒpɪt/, U.S.

/ˈtɑpɪt/

Origin: Probably a variant or alteration of another lexical item. Etymon: toppet n.¹

Etymology: Probably a variant of toppet n.¹

Mining. Now historical.

A small cross-shaped or T-shaped attachment at the top of a boring rod, around which the runner (runner n.¹ 17c) is hooked in lifting the rod.

ΘΚΠ

society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > parts or attachments

topit1839

brake1849

tiger1864

bore-log1870

brace-head1875

stretcher-bar1883

sabot1884

1820 Edinb. Encycl. (1830) XIV. 328/1 Topits, or top-pieces are used for each length of rods so cut, and an instrument, named the runner, is used for taking hold of the topits.

1839 A. Ure Dict. Arts 966 The runner, for taking hold of the topit.

1908 R. A. S. Redmayne Mod. Pract. Mining I. iv. 87 When it is desired to draw the rods..a ‘runner’ is attached to the rope and passed over the rods to the top of which the ‘topit’ has been screwed.

1970 B. F. Duckham Hist. Sc. Coal Industry 1700–1815 ii. 43 (caption) The Borer's Tools..12. Key for screwing/unscrewing rods 13. Topit 14. Beche 15. Runner.

This entry has been updated (OED Third Edition, September 2022).

单词	topit
释义	topitn. Brit. /ˈtɒpɪt/, U.S. /ˈtɑpɪt/ Origin: Probably a variant or alteration of another lexical item. Etymon: toppet n.¹ Etymology: Probably a variant of toppet n.¹ Mining. Now historical. A small cross-shaped or T-shaped attachment at the top of a boring rod, around which the runner (runner n.¹ 17c) is hooked in lifting the rod. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > boring tool > for boring in the ground > parts or attachments topit1839 brake1849 tiger1864 bore-log1870 brace-head1875 stretcher-bar1883 sabot1884 1820 Edinb. Encycl. (1830) XIV. 328/1 Topits, or top-pieces are used for each length of rods so cut, and an instrument, named the runner, is used for taking hold of the topits. 1839 A. Ure Dict. Arts 966 The runner, for taking hold of the topit. 1908 R. A. S. Redmayne Mod. Pract. Mining I. iv. 87 When it is desired to draw the rods..a ‘runner’ is attached to the rope and passed over the rods to the top of which the ‘topit’ has been screwed. 1970 B. F. Duckham Hist. Sc. Coal Industry 1700–1815 ii. 43 (caption) The Borer's Tools..12. Key for screwing/unscrewing rods 13. Topit 14. Beche 15. Runner. This entry has been updated (OED Third Edition, September 2022). < n.1820
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