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Inventory no. 50738 - Former Display Label

German SECTOR
1742

Brass. Signed, and dated, "J. L. Koch. fecit. Berolini. 1.7.4.2."
With scales marked "Tangent.", "Reduc. Plan. et. Corp. regul.", "Tetrag.", "Sub. Ang. Polÿg", "Arithm.", "Geomet.", "Inscriptio.", "Corp sphæ.", "Fortificat.", "Metallica.", "Circ. divid.", "Chord ar.", "Cubica.", "Rectæ", "Divisia", "Circumf. Extrema. ac. media. ratione. secandi." and "Diam.".

J. L. Koch was perhaps related to the instrument-makers Johann Koch (seventeenth century) and K. Koch (eighteenth century), both of whom worked in Berlin.

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Billmeir Collection

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