. The Decorator's assistant. 2. Multiply continually together the twodiameters a b, c d, and the number 11. Dividethe last product by 14, and the quotient will bethe area nearly true. Example.—What will be the area of theellipse A D E c A, its transverse a b being 15feet, and its conjugate c d 10 feet?. THE DECORATOR S ASSISTANT. 195 1510 150 11 J 2) 1650 7) sq. ft. = area. 3. Multiply continually together the twodiameters, and the number .7854, and theproduct will be the area of the ellipse. Example.—What will be the area of anellipse, the transverse being 25 inches, andconjugat
. The Decorator's assistant. 2. Multiply continually together the twodiameters a b, c d, and the number 11. Dividethe last product by 14, and the quotient will bethe area nearly true. Example.—What will be the area of theellipse A D E c A, its transverse a b being 15feet, and its conjugate c d 10 feet?. THE DECORATOR S ASSISTANT. 195 1510 150 11 J 2) 1650 7) sq. ft. = area. 3. Multiply continually together the twodiameters, and the number .7854, and theproduct will be the area of the ellipse. Example.—What will be the area of anellipse, the transverse being 25 inches, andconjugate 18 inches ? 2518 450 .7854 39270031416 sq. in. = area. END OF MENSURATION OF SUPERFICES. Makers of magnets and compass-needlesknow that if the most careful and skilful work-men be employed in preparing a number ofmagnets from the same steel bar, the magneticpower of the magnets, when compared witheach other, will greatly vary; although everypossible care may be taken in forging, temper-ing, and magnetising, in an uniform in these matters convinced me thatdiscrepancies in the magnetic powers of mag-nets of the same length, weight, and quality ofsteel, arise from the tempering alone; for ifthe metal be heated in a furnace, or coal fire,one part of the bar may be in con
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