A shorter course in woodworking; a practical manual for home and school (1911)
Wheeler, Charles G. (Charles Gardner), 1855-1946 · New York, London, G.P. Putnam's sons · leaf 254
rcumference, and the last pointshould be opposite the first. But in all suchwork it is impossible to be absolutely accurate,therefore it is well to also measure around theother way and, if the points do not coincide, takea point midway between. The accuracy of a semi-circular hollow canbe tested by… … Fig. 614 22. To inscribe an octagon in a given circle Thus in a semi-circle chords drawn from any point in the circumference to the endsof the diameter will form a right an-gle with each other. In Fig. 615DAE, DBE, and DCE will be rightangles. Consequently the diameterof a circle can be found…
Woodwork
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![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-123-337.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-34-47.webp)