Practical lessons on the lever escapement, its tests, errors, their detection and correction (1916)
Wilkinson, T. J. (Thomas Jessop), b. 1864 · Philadelphia, Penna., Technical publishing company · leaf 17
ater the number of degrees contained by thatangle. The size of an angle is measured by the extent of its 12 opening relative to the 360 degrees in a circle. We shall thereforediscuss angles and their degrees in our discussion of circles. CIRCLES 95. A circle is a plane figure bounded by a curved… … Fig. 4 straight line drawn from circumference to circumference andpassing through the circles center. The lines A D and K B arediameters of the circle (Fig. 4). RADIUS 96. The radius of a circle is any straight line draivn from thecenter to the circumference. The lines E C, E B, etc., are radiiof…
Clocks and watches
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-177-18.webp)
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-94-67.webp)
