Some brief remarks upon Mr. Jacob's treatise on wheel-carriages. [electronic resource] : Containing Chap. I. The Sample. II The Magic-Levers. III. Vis Inertiae. IV. Great Stones. V. The Imaginary Draught-Line. VI. The Challenge. By Daniel Bourn. Reader, I should not have taken the Pains to write an Answer to Mr. Jacob's Treatise, had it not been manifestly calculated to mislead the Publick with Respect to the Principles and Utility of Rolling Carriages, which are, at present, on the Eve of being introduced, and duly encouraged.