A quite unusual item designed by Victor Sabouret and manufactured by Jules Carpentier, here well preserved in its original box.
According with the Carpentier’s catalogue published in 1904 :
“This device is intended to read the speed of a train as it passes a point on the line.
It consists of a small cylinder on which are simultaneously drawn:
1. Signals proportional to time, produced by a tuning fork ;
2. Signals proportional to the spaces traveled, produced by a tracer stylus, operated remotely, by a series of four pedals placed along the rail, at known distances, and lowered by the passage of the first wheel of the train.
The device is small enough to be able to be hidden in the ballast: it is contained, with all its accessories, in a transport case. “(Carpentier catalogue of 1904, page 124 ; see the last picutres).
A good example, lack only the paper and the quill.
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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.