单词 | poppet-head |
释义 | poppet-headn. 1. Either of the upright stocks of a lathe. Cf. poppet n. 4b. Now rare. ΘΚΠ society > occupation and work > equipment > machine tool > lathe > [noun] > lathe-head poppet-head1665 puppet1680 puppet head1725 poppet1791 lathe-head1889 1665 R. Hooke Micrographia Pref. sig. E1v AB signifies the Beam of a Lath fixt perpendicularly or Horizontally, CD the two Poppet heads, fixt at about two foot distance. 1791 J. Townsend Journey Spain III. 178 They sit on a low stage, above which the two poppet heads and points are raised six inches, and instead of a pole and treddle they use a bow. 1851 Encycl. Americana XII. 385 If the poppet-heads, supporting the mandrel, be made regularly to move from side to side, during the rotation.., the cuts will not be circular, but undulating. 1857 Catal. 9th Exhib. Inventions in Jrnl. Soc. Arts 5 App. I. 22/1 The [lathe-]bed has two openings, one to receive the poppet-head, and the other to receive the slide-carriage. 1940 H. J. Massingham Chiltern Country iv. 64 The supports of the lathe itself are rough uprights or ‘trees’, one at each end cut down to a height suitable for the two parallel planks (the ‘rest’) that are the bed of the lathe and take the poppet heads. 2. Mining. The frame at the top of a shaft, supporting the pulleys for the ropes used in hoisting. Now chiefly Australian and New Zealand. ΘΚΠ society > occupation and work > equipment > mining equipment > [noun] > pit equipment > at head of shaft pit frame1760 headgear1835 poppet-head1869 society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > mouth or top of mine or shaft > apparatus at mouth of shaft puppet head1778 headgear1835 headstocks1845 poppet-head1869 head house1870 shaft-house1872 shaft-tackle1874 shut1886 1869 Times 24 Apr. 12/4 The poppet-heads have pulleys in their upper portions, over which drawing chains work. 1888 F. Hume Madame Midas i. v. 39 The wheels were spinning round in the poppet-heads as the mine slowly disgorged the men who had been working all night. 1917 ‘H. H. Richardson’ Fortunes Richard Mahony I. iii. vi. 221 Here and there a tall chimney belched smoke, beside a lofty poppet-head, or an aerial trolley-line. 1956 H. Hudson Flynn's Flying Doctors 220 We..then saw beneath us the poppet-heads and iron roofs of Tennant Creek—a mining town. 2004 Herald Sun (Melbourne) (Nexis) 6 Feb. 27 The motorcade continued past mine shafts, mullock heaps and poppet heads until it reached the Prospectors and Miners Hall of Fame. This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022). < n.1665 |
随便看 |
英语词典包含1132095条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。