Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 457
In enclosed spaces, owing to the reflected sounds or some other cause, thereare certain pitches or keys peculiar to every room, and to speak with ease,the speaker must adapt his tone to those keys. The larger the room, theslower and more distinct should be the articulation. It has been observed,… … ARCHITECTUEAL DRAAVIXG. 291 be made useful wlieii tlie rooms are heated by hot air, by introducing theair near the speaker, and placing the ventilators or educts at the outsideof the rooms, and by placing their apertures rather nearer the bottomof the room than at the top. It would seem much better…
![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-118-325.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-97-194.webp)
