The works of Thomas Dick . goround the lesser. Mechanics, in recognisingsuch theorems, will meet with many opportuni-ties of reducing them to practice.—^Again, thereis a figure which Geometricians term a parabola^which is formed every time we pour water for-cibly from the mouth of a tea-kettle, or throw astone forward from the hand. One property ofthe parabola is, that if a spout of water be di-rected at half a perpendicular from the ground,or at an angle of elevation of 45 degrees, it willcome to the ground at a greater distance thanif any other direction had been given it, a slightallowance
The works of Thomas Dick . goround the lesser. Mechanics, in recognisingsuch theorems, will meet with many opportuni-ties of reducing them to practice.—^Again, thereis a figure which Geometricians term a parabola^which is formed every time we pour water for-cibly from the mouth of a tea-kettle, or throw astone forward from the hand. One property ofthe parabola is, that if a spout of water be di-rected at half a perpendicular from the ground,or at an angle of elevation of 45 degrees, it willcome to the ground at a greater distance thanif any other direction had been given it, a slightallowance being made for the resistance of tUeair. Hence the man who guides the pipe of aiire-engine may be directed how to throw thewater to the greatest distance, and he who aimsat a mark, to give the projectile its proper di-rection.—To surveyors, navigators, land-mea-surers, gaugers and engineers a knowledge ofthe mathematical sciences is so indispensablyrequisite, that, without it, such arts cannot beskilfully exercised. c. gle. In like manner the lines A D, and B D, A B andB E, will stand at right angles to each other; andthe same will be the case to whatever point of thecircle such lines are drawn. The practical appli-cation of this principle, in various operations, will,at once, be obvious to the intelligent mechantc, es-pecially when he intends the two ends or sides ofany piece of machinery to stand perpendicular toeach other. The phi/sical sciences are also of the greatestutility in almost every department of art. Tomasons, architects, ship-builders, ^carpentersand every other class employed in combiningmaterials, raising weights, quarrying stones,^uilding piers and bridges, splitting rocks, orpumping water from the bowels of tlie earth,—aknowledge of the principles of mechanical anddynamics is of the first importance. By meansof these sciences the nature of the lever andother mechamcal powers may be learned, andtheir forces estimated—the force produced byany particular
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