The principle to be employed is, that at the passage of those places the engine itself should, in its transit, wind up a weight or spring. That this weight should act upon an arm standing perpendicularly, which would immediately commence moving slowly to the horizontal position. This it should attain by an equable motion at the end of three, five, or any desirable number of minutes.
The means of raising the weight may be derived either from a projection below the engine or by one above it. The latter, which seems preferable, might be attached to a light beam traversing the road to which the apparatus should be fixed.
LIST OF MR. BABBAGE’S PRINTED PAPERS.
Many applications having been made to the Author and to his Publishers, for detached Papers which he has from time to time printed, he takes this opportunity of giving a list of those Papers, with references to the Works in which they may be found.
1. The Preface; jointly with Sir John Herschel.—Memoirs of the Analytical Society. 4to. Cambridge, 1813.
2. On Continued Products.—Ibid.
3. An Essay towards the Calculus of Functions.—Phil. Trans. 1815.
4. An Essay towards the Calculus of Functions, Part. 2.—Phil. Trans. 1816. P. 179.
5. Demonstrations of some of Dr. Matthew Stewart’s General Theorems, to which is added an Account of some New Properties of the Circle.—Roy. Inst. Jour. 1816. Vol. i. p. 6.