keystoningn.

Brit.

/ˈkiːstəʊnɪŋ/, U.S.

/ˈkiˌstoʊnɪŋ/

Origin: Formed within English, by derivation. Etymons: keystone n.¹, -ing suffix¹.

Etymology: < keystone n.¹ + -ing suffix¹. Compare later keystone v. 2.

The action of giving something a trapezoidal shape; the result of this. Now chiefly Cinematography, Television, and Photography: the keystone effect; distortion arising from this.

ΚΠ

1929 U.S. Patent 1,727,972 2/2 The keystoning of the groups [of wires] into a cylindrical composite as shown in Fig. 4 is only possible due to the fact that each group is loosely stranded prior to the assembly of these groups.

1934 U.S. Patent 1,969,461 1/2 Keystoning in the lantern slide projector due to such obliqueness can be readily overcome by counter-keystoning of the slides.

1957 R. M. Whaley et al. Proc. Southern Calif. Industry-educ. Conf. 77/1 Keystoning effects and focusing problems encountered in photographing the apparatus.

1972 R. G. Middleton Transistor Television Servicing Guide (rev. ed.) vii. 86 A thermistor in the vertical-deflection coil circuit will occasionally..develop an abnormal resistance characteristic that will produce keystoning.

2006 South China Morning Post (Hong Kong) (Nexis) 23 May 5/ It [sc. the projector] can automatically detect the angle of the projector relative to the screen and adjust for keystoning.

This entry has been updated (OED Third Edition, December 2012; most recently modified version published online March 2022).

单词	keystoning
释义	keystoningn. Brit. /ˈkiːstəʊnɪŋ/, U.S. /ˈkiˌstoʊnɪŋ/ Origin: Formed within English, by derivation. Etymons: keystone n.¹, -ing suffix¹. Etymology: < keystone n.¹ + -ing suffix¹. Compare later keystone v. 2. The action of giving something a trapezoidal shape; the result of this. Now chiefly Cinematography, Television, and Photography: the keystone effect; distortion arising from this. ΚΠ 1929 U.S. Patent 1,727,972 2/2 The keystoning of the groups [of wires] into a cylindrical composite as shown in Fig. 4 is only possible due to the fact that each group is loosely stranded prior to the assembly of these groups. 1934 U.S. Patent 1,969,461 1/2 Keystoning in the lantern slide projector due to such obliqueness can be readily overcome by counter-keystoning of the slides. 1957 R. M. Whaley et al. Proc. Southern Calif. Industry-educ. Conf. 77/1 Keystoning effects and focusing problems encountered in photographing the apparatus. 1972 R. G. Middleton Transistor Television Servicing Guide (rev. ed.) vii. 86 A thermistor in the vertical-deflection coil circuit will occasionally..develop an abnormal resistance characteristic that will produce keystoning. 2006 South China Morning Post (Hong Kong) (Nexis) 23 May 5/ It [sc. the projector] can automatically detect the angle of the projector relative to the screen and adjust for keystoning. This entry has been updated (OED Third Edition, December 2012; most recently modified version published online March 2022). < n.1929
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