| 释义 |
▪ I. tapping, vbl. n.1|ˈtæpɪŋ|
[f. tap v.1 + -ing1.]
1. a. The action of tap v.1 in various senses.
1597A. M. tr. Guillemeau's Fr. Chirurg. 20 b/2 In the drawing or tappinge of the water. 1655Culpepper Riverius vii. v. 164 The Opening or Tapping for the Dropsie. 1713Cheselden Anat. iii. x. (1726) 228 This kind of dropsie is sometimes cured by tapping. c1865J. Wylde in Circ. Sc. I. 410/2 They are..obtained from the tree.., by the process of ‘tapping’. 1905H. D. Rolleston Dis. Liver 171 A woman..eventually died after her sixtieth tapping. 1909Installation News II. 172/1 Alternating current..is carried into one side of the transformer giving 50 volts on the secondary at one tapping for lighting purposes, and three other tappings at 7, 12½ and 20 volts for cooking and heating.
b. concr. That which is drawn by tapping, or runs from a tap; a means of tapping.
1597A. M. tr. Guillemeau's Fr. Chirurg. 53 b/1 His drinck, harshe and noughtye tappinges of wyne. 1686Plot Staffordsh. 17 It smelt just like the soure tappings of dead beer in a Cellar. 1862Dana Man. Geol. 648 All wells and springs are tappings of these subterranean waters.
c. attrib. and Comb., as tapping-apparatus (Knight Dict. Mech. 1877); tapping-bar, a sharp-pointed crowbar used in opening the tap-hole of a furnace; tapping-clay, plastic clay used to close a tapping-hole; tapping-cock, a cock having a taper stem, which allows it to be driven firmly into an opening; tapping-drill, a drill for boring holes in water-pipes; tapping-gouge, a gouge used in tapping the sugar-maple; tapping-hole, (a) a tap-hole in a furnace; (b) a hole drilled in metal to be tapped or furnished with an internal screw-thread; tapping-iron = tapping-gouge; tapping-machine, (a) a machine for cutting internal screw-threads; (b) a machine for tapping water- or gas-mains, a tapping-drill; tapping-pot, a pot to receive liquid metal from the tap-hole; tapping-tool, (a) = tap n.1 4; (b) any implement for tapping the sugar-maple.
1861Fairbairn Iron 133 The fire is to be carefully raked out at the *tapping hole, which is again to be made good with loam. 1894Bowker in Harper's Mag. Jan. 418 A channel known as the tapping-hole, taps the metal from the crucible.
1840Gosse Canadian Nat. vi. 68 A semicircular incision is made [in the tree] with a large iron gouge, called a *tapping iron.
2. (In senses 2 c, 3 of the vb.)
1931T. Horsley Odyssey of Out-of-Work xxiii. 243 You do the tapping; I'll wait for you at the gate. 1955‘E. Crispin’ Fen Country (1979) 54 A line from your special switchboard..could be made safe from tapping. 1966Times 14 Nov. 10/6 Mr. Russell Kerr..is to ask the Home Secretary..on how many occasions warrants have been issued for the tapping of M.P.s' private telephones.
b. spec. in Electr. Engin., an intermediate connection made in a winding.
1903K. Edgcombe Whittaker's Electrical Engineer's Pocket Bk. 244 The secondary of one of the transformers is wound to give a voltage equal to the required three-phase line-to-line voltage, and is divided into two equal parts by a middle tapping. 1934Discovery Oct. 301/2 Twelve tappings are fitted to give an impedance range of 1·6 to 25,000 ohms. 1950Engineering 22 Sept. 245/3 Tappings from the secondary and filament windings are connected to the electrodes. 1975G. J. King Audio Handbk. iii. 71 A tapping on the resistive element facilitates coupling of the loudness filter.
c. attrib. and Comb. (sense 2 b), as tapping point; tapping coil Electr. Engin., a coil which acts as a tapping.
1933P. Kemp Alternating Current Electr. Engin. (ed. 4) xiv. 188 In order to permit of a slight variation in the secondary terminal voltage, it is usual to provide a number of tapping coils in the L.T. winding. 1958J. Shepherd et al. Higher Electr. Engin. xiv. 344 The tapping coils are placed physically in the centre of the transformer limb to avoid unbalanced axial forces acting on the coils. Ibid. 343 If..contact with position 2 is made before contact with position 1 is broken, the coils connected between these two tapping points are short-circuited, and will carry damagingly heavy currents.
▪ II. ˈtapping, vbl. n.2
[f. tap v.2 + -ing1.]
a. The action of tap v.2; the sound made by this action; † in Etching: see quot. 1688 (obs.); also spec. tap-dancing. Also reduplicated, tap-tapping, repeated or continued tapping.
c1440[see tap v.2 1]. 1688R. Holme Armoury iii. 151/1 Tapping, is wip[ing] or sliding ones hand upon the Varnish to make it smooth and even on the Plate. 1786F. Burney Diary 6 Nov., I heard a tapping from a window upstairs. 1860Russell Diary in India II. xvii. 321, I was informed that the tents were going to be struck immediately, and the tap-tapping of the kelassees confirmed the fact. 1872Black Adv. Phaeton xxxi, Here a tapping all round the table greeted the orator. 1944J. Johns A.B.C. Tap Dancing 2 ‘Tapping’ has few stable rules but limitless variations.
b. The soling or heeling of boots and shoes. dial. and U.S.
1857Eadie J. Kitto ii. (1861) 44 Revelations about list and leather, tapping and closing.
c. attrib. and Comb., as tapping test; tapping key Electr. = key n.1 12 a; tapping-room, a room in which tapping or boot-soling, etc. is done.
1895Westm. Gaz. 17 Apr. 2/3 So the tapping test for railway carriage axles is a fraud. 1905Ibid. 21 Sept. 7/1 An adjoining factory used..as a tapping room. 1916‘Boyd Cable’ Action Front 173 These [orderlies]..brought them long screeds to be translated to the tapping keys. 1938Brit. Jrnl. Psychol. XXIX. 41 Two tapping keys..were placed below the handles. |