T> 1 2 problem X. To draw a tangent to a given circle, passingthrough a given point a. 1. When the point a is in the circumferenceof the circle. From the centre o draw the radius o a.Then through the point a draw c d perpen-dicular to o a, and it will be the tangentrequired. c ^4^ ^ … (To be continued.) Lighting by Electricity.—Mr. Staitesnew Patent Electrical Lamp is said to go far-ther than heretofore in rendering electricallight available for practical purposes, as so longdesired. From a small battery power a compa-ratively large and steady as well as sustainedlight, is said…
Design · Decoration and ornament · Art
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from La prima-[quinta] parte della luce del dipingere et disegnare, ... (1643)](https://img.insideoutlibrary.com/img/200/ia-laprimaquintapar00pass-26-24.webp)
![An illustration from Cours d'architecture enseigné dans l'Academie royale d'architecture : premiere[-cinquième] partie ... (1675)](https://img.insideoutlibrary.com/img/200/ia-coursdarchitectu00blon-406-253.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-97-195.webp)
