Scribner's engineers' and mechanics' companion : comprising United States' weights and measures : mensuration of superficies and solids ... the mechanical powers ... steam and the steam engine (1848)
Scribner, J. M · New York : Huntington and Savage · leaf 79
. The ordinate at the middle of a chord is always °. 3. All the ordinates of a chord are in proportion to the rectangleof the two parts into w7hich they divide the chord. Thus, dividethe chord into 10 parts, equal; the middle ordinate will be expressedby 5x5 = 25 ; and the others will be… … In the cut, the chord A C, is divided into four equal parts: themiddle ordinate, y, is expressed by 2 x 2=4, and x and z are expressedby 1 x3=3 ; and x z are therefore each | of y. The 1st and 2d of these rules will be found useful for springing rails of any length, or any radius of curvature.…
Mechanical engineering · Weights and measures
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