| 单词 | crown sheet |
| 释义 | > as lemmascrown sheet crown sheet n. now historical (a) a sheet of crown paper (cf. sense 33a); (b) Engineering a metal plate forming the upper part of the firebox of a steam engine. ΚΠ 1765 G. Jacob Every Man His Own Lawyer 24 This must be engrossed on an half crown sheet of paper. 1818 A. Abbot Diary 8 Dec. in S. Carolina Hist. Mag. (1967) 68 133 Left the package with Mrs. S. containing a letter to Pres. Kirkland..& another to I. E. Sprague of Salem, inclosing a crown sheet to my wife. 1844 D. Lardner Investig. Causes Explosion Locomotive Engine, ‘Richmond’ 19 The fire box is constructed of the best quality iron, 5-16 thick, the crown of which is supported by 8 cast iron stay bars..secured to the crown sheet by 1 inch bolts. 1927 Jrnl. Amer. Water Wks. Assoc. 18 433 The dropping of crown sheets due to overheating by reason of the insulating effect of heavy scale deposits was not uncommon. 1964 Trans. Amer. Philos. Soc. 54 12 It was a four-page newspaper, first printed on a crown sheet, then on demy. 2003 J. P. Lamb Perfecting Amer. Steam Locomotive 17 When the water level surrounding the furnace dropped below the top of the crown sheet, the structure could weaken and cause the boiler to explode. < as lemmas |
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