Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 392
e graphically illustrated by meansof valve diagrams, of which there are several differentkinds, notably the Bilgram and Zeuner. The Zeuner dia-^am will be made use of in this instance. Valves and Valve Setting 379 Kgure 123 shows the total movement of the valve, re-gardless of lap and lead. First… … Kadfus* OP £c^cntfiif/fy -^ Zi^*^ Fig. 123 6 equals the radius of eccentricity. Line C D representsthe position of the crank when the valve is at mid triavelor in its central position, D being the location of the crankpin. Eeferring back to Fig. 116, the valve is there shownin its central position,…
![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-383-265.webp)