Railway and Locomotive Engineering . Q ARRANGEMENT OF WHISTLE ChAS. MARKEL, Shop Foreman, C. & N. W. , la. Circles and Squares. If a man goes into a large departmentstore and buys a yard of ribbon he gets acertain amount, and the only dimensionhe and the salesman speak of during thetransaction is the one we call length. Ifthe man buys 2 yds. he gets twice theamount he got in the first place. Where. STEAM WHISTLE VALVE OPENER. .iniple, 2 sq. ft. do not equal asurface of 2 ft. sq., and just here theold rule which says circles are to one?lanother as the squares of their
Railway and Locomotive Engineering . Q ARRANGEMENT OF WHISTLE ChAS. MARKEL, Shop Foreman, C. & N. W. , la. Circles and Squares. If a man goes into a large departmentstore and buys a yard of ribbon he gets acertain amount, and the only dimensionhe and the salesman speak of during thetransaction is the one we call length. Ifthe man buys 2 yds. he gets twice theamount he got in the first place. Where. STEAM WHISTLE VALVE OPENER. .iniple, 2 sq. ft. do not equal asurface of 2 ft. sq., and just here theold rule which says circles are to one?lanother as the squares of their diameterscomes in. If a 2-in. pipe is not adequatefor water supply and double the quantityis required, somebody will say let us havea 4-in. pipe put in and get twice as the 2-in. pipe delivers a certain quantityof water in a given time, a 4-in. pipe willdeliver not simply double the amount, butfour times the amount in the same period. When one follows out the firstpart of the rule for the squaring of thecircle, that is to multiply the diameterby itself, an area results. Mathema-ticians speak of multiplying a number byitself as squaring it, because multiplica-tion of two quantities involves the idea ofarea, or two dimension space. Havingsquared the diameter we really have asquare with the diameter of the circle asa side, and the circle which we wish toobtain the area of, is the inscribed express
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