sunglassn.

1591 R. Hill tr. W. Perkins Golden Chaine vi. sig. B4 And again, we see the Sunne beames gathering themselues into a Sunne glasse [L. vitrum], they burne such thinges as they light vpon.

1647 S. Gorton Incorruptible Key 60 The vast beames of the sunne, contracted into one narrow poynt in a Sun-glasse, burnes most fervently.

1804 M. Lewis Jrnl. 19 Aug. in Jrnls. Lewis & Clark Exped. (1986) II. 490 The main Chief Brack fast with us naked; & beged for a Sun glass.

1837 N. Hawthorne Mr. Higginbotham's Catastrophe in Twice-told Tales 150 After lighting a cigar with a sun-glass.

1923 Georgia Hist. Q. 7 159 The tradition is that a sunglass was used to start the fire with the rays of the sun, so as to suggest that the fire which destroyed was brought down from heaven.

2015 D. Canterbury Adv. Bushcraft iv. 71 There is a huge advantage to using a sunglass to create an ember. Since the sun is a renewable resource, you are not expending anything from your kit when you use it.

1801 Juvenile Libr. 3 132 The sun-glass at the end of the small tube should be unscrewed, when any other object, except the sun, is looked at.

1890 W. F. Stanley Surv. & Levelling Instruments ii. 47 Sun-glass.—Sextants and theodolites are supplied with a very dark glass or a combination of dark glasses fixed in a rim to form an eye-piece front.

1930 C. J. Stewart Aircraft Instruments 206 L is a dark sun-glass [in the Mark V Bubble Sextant].

2009 J. M. Vaquero & M. Vázquez Sun Recorded Hist. iii. 150 The event was independently observed by R. Hodgson at his home at Highgate with a refractor of six inches and a pale neutral tint sunglass.