Also -ile. [See prec. and STYLE.] In dialling, the line on which the style or gnomon stands.
1593. T. Fale, Horologiogr., 20. Extend your compasses, the one foote being placed in F. in the line of the Substile toward C. unto H.
1690. Leybourn, Curs. Math., 704. To find the true Hour distances upon the Plain from the Substiles.
1715. trans. Gregory’s Astron. (1726), I. 334. That they may be distinguished, and not confounded with the Substyle.
1764. J. Ferguson, Lect., 197. In all declining dials, the substile makes an angle with the hour-line of XII.
1795. Hutton, Math. Dict., II. 536.
b. attrib.
1636. in Rigaud, Corr. Sci. Men (1841), I. 27. How it comes to pass that Mr. Gunter and yourself should differ in placing the substile line.
1669. Sturmy, Mariner’s Mag., 57. There are two Lines called by the Names of Style and Substyle-Scale.
1764. J. Ferguson, Lect., 203. The line on which the stile or gnomon stands (commonly called the substile-line).
