In the Ninth Bridgewater Treatise, Mr. Babbage has employed several arguments deduced from the Analytical Engine, which afford some idea of its powers. See Ninth Bridgewater Treatise, 8vo, second edition. London, 1834. Some of the numerous drawings of the Analytical Engine have been engraved on wooden blocks, and from these (by a mode contrived by Mr. Babbage) various stereotype plates have been taken. They comprise— 1. Plan of the figure wheels for one method of adding numbers. 2. Elevation of the wheels and axis of ditto. 3. Elevation of framing only of ditto. 4. Section of adding wheels and framing together. 5. Section of the adding wheels, sign wheels and framing complete. 6. Impression from the original wood block. [Pg 4] 7. Impressions from a stereotype cast of No. 6, with the letters and signs inserted. Nos. 2, 3, and 5 were stereotypes taken from this. 8. Plan of adding wheels and of long and short pinions, by means of which stepping is accomplished. N.B. This process performs the operation of multiplying or dividing a number by any power of ten. 9. Elevation of long pinions in the position for addition. 10. Elevation of long pinions in the position for stepping. 11. Plan of mechanism for carrying the tens (by anticipation), connected with long pinions. 12. Section of the chain of wires for anticipating carriage. 13. Sections of the elevation of parts of the preceding carriage. All these were executed about five years ago. At a later period (August 1840) Mr. Babbage caused one of his general plans (No. 25) of the whole Analytical Engine to be lithographed at Paris. Although these illustrations have not been published, on account of the time which would be required to describe them, and the rapid succession of improvements made subsequently, yet copies have been freely given to many of Mr. Babbage’s friends, and were in August 1838 presented at Newcastle to the British Association for the Advancement of Science, and in August 1840 to the Institute of France through M. Arago, as well as to the Royal Academy of Turin through M. Plana.—EDITOR.]