Handbook for carpet measurers, cutters and salesmen (1905)
Lind, John W[ilhelm], 1861- [from old catalog] · New York, G. Lundoe, The American carpet and upholstery journal · leaf 117
angle, namely,that the square of the longestside is equal to the squares ofthe two shorter added together,provided any two sides in thetriangles ADP and APC are known, the rest can alwaysbe found. (13) Thus, if given the radius and chord AB or itshalf AP. Then VAC2-AP2=CP and CD-CP=DP;… … (16) And when AD and AB are given then ADB8AD-AB TO ESTIMATE ON CARPETS 103 THE ELLIPSE To find the circumference of an ellipse. (17) Rule. Multiply half the sum of the two diametersby 3,1416 and the product is the circumference nearly. TO FIND THE AREA OF AN ELLIPSE (18) Rule. Multiply the product…
Carpets
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-172-16.webp)
