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Instruction book, for set of specific gravity beads

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probably made in Edinburgh

Instruction book, for set of specific gravity beads
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This instruction book is for a set of specific gravity beads made around 1810, probably in Edinburgh by Isabella Lovi, the widow of a scientific instrument maker, Angelo Lovi, who emigrated to Scotland from Milan in 1772.

Mrs Lovi patented her improvements to the glass 'philosophical bubbles' in 1805, and published a later booklet, 'Directions for Using the Patent Aerometrical beads and Sliding Rule, for ascertaining the specific gravities or strengths of spirituous liquors ... with Tables.' This is dated 1813, and was published in Edinburgh.

The set features 363 specific gravity beads, together with two slide rules, a thermometer, six glass rods and this instruction book. The set could have been used for a variety of purposes: from ether to concentrated sulphuric acid, which is why there are so many individual glass 'beads', each marked with their respective specific gravity. The Highland Society of Scotland were keen to see it applied to testing the quality of milk, and awarded Mrs Lovi a premium in 1816.

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