J. Berthaud & Fils constructeurs à Lyon, wire torsiometer, end of 19th-beginning of 20th century, wire torsion measuring system operated by a small crank, gilt brass case with double graduation fixed to a walnut plate, (missing crank), 84 x 19.5 cm. We join two other later torsiometers to the mark Stutz&Cie in Lille and (oxide and lacks), 93 x 17 cm and 100 x 17,5 cm.
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