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Scientific American, Vol. 44, No. 19 (1881) (1881)

leaf 7

An illustration from Scientific American, Vol. 44, No. 19 (1881), 1881, leaf 7
s sweeter and better than it would have been had ing the focus of any lens from three inches to seventy-two | Erie Canal: the prism to be 70 feet wide at water surface, | it been drawn from a closed well with a pump of any kind. inches, while the length of the instrument is only thirteen | 5214… … case of a dealer, and will be found very useful since its buckets are perfectly balanced. The by any one dealing in spectacles as well as the shaft of the windlass is mounted on roller bear- ings, reducing the friction to a minimum. regular optician. This invention was recently patented in this For…

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