A very good and early example of an Alfred Donné Lactometer, invented around 1840 and used to determintate the density of cream in the milk for cheese and butter, and also to measure the quality of the mother’s milk.
The present example is signed “Lactoscope du Dr. Donné / J. Duboscq-Soleil à Paris”. Jules Duboscq took the business of his father-in-law Jean-Baptiste Soleil in 1849. So, according with the signature, we can date the instrument from the very early 1850s’.
The instrument in its superbe original condition and preserved in its charming shaped-case.
We can note only a little lack of brass from the original cast.
Case measures 13×5,5 cm.
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Established by Alexandre Piffault in 2014 and based in Paris at 5 rue de Condé, 75006, very close to Odéon, Le Zograscope specializes in antique and rare books in Science, Medicine and Technology, and rare antique instruments in the same fields. We have especially a strong interest in early and continental microscopy, early and special mathematical/drawing instruments, medical and surgical instrument, and rare technology.