Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 737
form the rise and the other the tread of the steps. From the top of the firststep to the top of the upper continue a line a d^ till it meets the perpendicularS V prolonged in v; this line will be the inclination or pitch of the stairs ; ifthrough the top of the step at the other extremity a similar… … Fig. 1803. As the pitch lines of both sides of the stairs meet the central vertical in thesame point, in like manner v will be the vanishing point of all lines having asimilar inclination to the plane of the picture. The projection of the otherflight of stairs will be easily understood from the…
Mechanical drawing
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![An illustration from Libro primo [-quinto] d'architettvra ... (1566)](https://img.insideoutlibrary.com/img/200/ia-libroprimoquinto00serl-77-98.webp)
![An illustration from Eyn schön nützlich Büchlin vnd Vnderweisung der Kunst des Messens mit dem Zirckel, Richtscheidt oder Linial : zu nutz allen Kunstliebhabern fürnemlich den Malern, Bildhawern, Goldschmiden, Seidenstikern, Steynmetzen, Scheinern auch allen Andern so sich der Kunst des Messens (Perspectiua zü latin gnant) zügebrauchen Lust haben : darin Man auch solche Kunst leichter dan ausz etzlichen hieuorgetruckten Büchern begreiffen vn lernen mag mit vil [i.e., 56] schönen darzü dienenden Figuren (1531)](https://img.insideoutlibrary.com/img/200/ia-eynschnntzlichbc00rodl-47-61.webp)
