FOR PRACTICAL MEN: CONTAINING EXPLANATIONS OF THE PRINCIPLES OF MECHANICS; THE STEAM ENGINE, WITH ITS VARIOUS PROPORTIONS; PARALLEL MOTION, THE PRINCIPLES OF WHICH ARE FULLY AND CLEARLY INVESTIGATED, WITH TABLES OF SAFETY-VALVE LEVERS; TABLES OF THE WEIGHT OF CAST IRON PIPES; Strength and Stress of Materials ; With their Application to the Theory of Fly Wheels, &c.; BY JAMES HANN, TEACHER OF MATHEMATICS, AND ISAAC DODDS, CIVIL ENGINEER. The labour spent on books or arts Is both a waste of time and parts, If not directed to that end On which man's worth and weal depend. Newcastle upon Tyne: PRINTED FOR THE AUTHORS BY MACKENZIE AND DENT, PILGRIM STREET. ΤΟ THE RIGHT HONOURABLE HENRY LORD BROUGHAM AND VAUX, LORD HIGH CHANCELLOR OF Great Britain. WE beg Leave to inscribe this little Work to your Lordship, as a humble Tribute of Gratitude for your able, determined, and persevering Efforts, both to promote the Education and to ameliorate the Condition of your Fellow Men; and that your Lordship may long live to enjoy that Happiness and Peace of Mind which ever attend a Life spent in the Advancement of Science and the Improvement of our Species, is the ardent and sincere Wish of THE AUTHORS. Heworth Shore, |