A RARE LATE 19TH CENTURY 'BUTTERRE-FRACTOMETER', Carl Zeiss, Jena, with thermometer and other accessories in case--10in. (5.4cm) high; and a steam engine recorder with accessories in case--4½in. (11.4cm) high (2)

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A RARE LATE 19TH CENTURY 'BUTTERRE-FRACTOMETER', Carl Zeiss, Jena, with thermometer and other accessories in case--10in. (5.4cm) high; and a steam engine recorder with accessories in case--4½in. (11.4cm) high (2)

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