A fine A Berthélemy nickel-plated brass surveying level
Lot 104*
A fine A Berthélemy nickel-plated brass surveying level
Sold for £720 (US$ 1,176) inc. premium

Lot Details
A fine A Berthélemy nickel-plated brass surveying level
signed A. Berthelemy, Bte s.g.d.g. a Paris, the telescope with rack and pinion focusing and dust cap to the object glass, located in twin supports with clamps holding the upper limb with bubble level and fine rack and pinion adjustment for two prisms arranged on the upper bar, the prisms and rack motion arranged to rotate for side viewing, the lower bubble with fine screw adjustment by key, the lower limb with fine screw vertical adjustment, raised on a truncated column over the horizontal plate incorporating a bubble level, fine screw adjustment and clamp, on tripod stand with three adjustable screw feet, contained in the original fitted mahogany case with maker's trade label -- 17in. (43.2cm.) wide

Footnotes

  • The Conservatoire National des Arts et Métiers catalogue describes and illustrates a similar piece as, "Niveau type de la commission du Nivellement général de la France avec diastimométre Sanguet construit par Barthélémy" (item 17, pp. 87-89). The entry continues: "Cet appareil permet de déterminer la différence de niveau de deux points éloignés d'une centaine de mètres avec une approximation de l'ordre du millimètre. Le diastimomètre est un prisme qui peut être amené devant l'objectif de la lunette. Ce prisme dévie les rayons lumineux d'un angle constant et connu réalisant ainsi un stadimètre à angle. La différence des lectures faites sur la mire avec et sans interposition du diastimomètre permet de connaître la distance de celle-ci au niveau".

Saleroom notices

  • This lot to be offered without fitted case.
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