Made in France (Lens: Japan)

Used at the laboratory of the First Gymansium of Nauplion, one of the first secondary schools of the Greek State.

The anemometer measures the wheel revolutions transforming them in meters. In order to measure the wind speed the observer needs a chronometer (distance/time).

Richard catalogue, 1900, Exposition universelle de Paris

The apparatus is probably made by Krüss company.

Model DKM3-A
Serial No 188524
The DKM3-A is a variant of the Double Circle Triangulation Theodolite DKM3, the principal changes being those necessary to facilitate the addition of an astronomic micrometer accuracy: The results indicate that the DKM3-A is capable of producing first-order latitude and longitude determinations.

This Auto-registering Micrometer was used to register stars transits at the Sygros (Gautier) Meridain Circle of the Observatory.
The Photoelecric Photometer attached to the Micrometer (right on the photo) is a G. Rougier model (c. 1925).

Similar instruments:
Observatoire de Paris (Paris inv. 396, anc. 20-28)
Musée de l'Observatoire de Marseille (CM31 IM13000021)

The instrument was first described in 1832 by the German chemist Carl Friedrich Mohr. It is a balance with two arms, where the equilibrium is reached by adding weight on a tray. This type of instrument was modified by G. Westphal who replaced the tray with an adjustable counterweight. Used to study the buoyant force.

The column of mercury is suspended to a bent balance beam with a counterweight. The pressure is proportional to the weight of the mercury in the tube The variation of the pressure are inscribed on a movable board which
thanks to a clockwork slowly descend along the vertical rails.