Henry Green applies for a patent for a spirit level

08/05/1890 |

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Henry Green applied for a patent for further improvements he'd made to spirit levels.

Green assigned this patent to the Acme Rule Company of Salisbury, Connecticut.

Green applied for a patent on a pocket level yesterday.

Green would receive his patent, No. 449,609, on March 31, 1891.
Green would apply for a patent on an incandescent electric lamp on August 22, 1891.

United States Patent Office, "Spirit Level," Patent No. 449,609, March 31, 1891.

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