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on the other an elder pith ball. The weight of the copper rod is used to tighten the metallic wire without disrupting it. In the glass plate towards its rim there is a hole through which another rod with

Faraday constant F and properties of the Brownian motion. They used a self- made oil droplet apparatus and published their results in several articles. The core element of Millikan's setup are two [...] with a bright light source. A scale reading and a stopwatch are used to calculate the rate of ascent and descent of the droplets. further reading Panusch, Martin (2012): Bestimmung der Elementarladung

detectors in terms of precise measurements they are only put to use in civil and educational environments. further reading Korff, Sebastian (2014): Wie das Knacken in den Geigerzähler kam.

predicted by the positioning of the brass rings. This device can be used to demonstrate Galileo’s postulate on the superposition of the constant horizontal velocity and the accelerated free fall motion.

top of which has a hemicircular vellum-bound notch. The vellum is used in order to reduce friction for a ball running along the notch. Strings are clamped above the notch to reproduce the positions of [...] , in: Gooding, David; Pinch, Trevor; Schaffer, Simon (Eds.): The uses of experiment - Studies in the natural sciences, New York, Melbourne: Cambridge University Press.

Hydrostatic Balance on the model of 's Gravesande This device is used to determine the density of liquids. To do so the two cups below the scale pans are filled with different liquids. Attached to the

of liquids. It was developed in the early 19th century and put to use by the British Customs Services to measure the alcoholic strength. The Hydrometer in our HistoLab is an original, the inscription on

periodicals of both the old and new world. By his own account he used standard barometric tubes and a rubber ball or a syringe to produce an underpressure. The litrameter ist a device to determine the

object appears in an upright position. Thus, the instrument can be used for both terrestrial and astronomical observation. The reconstruction of this telescope was realized by Tiemen Cocquyt.

ancient octant (eigth part of the circumference of a circle) and is used to measure the angular difference between the horizon and the sun. To take a sight , the sun's image is reflected by a moveable mirror [...] of the sextant. Additional optical filters (grey or coloured) are used to avoid damage to the eye by the intense light of the sun and also to reduce disturbances of the reflected image caused by e.g. [...] Jesper (2013): Geomat.dk : Historical Instruments of Navigation – used as Educational Tools in Mathematics , in: P. Heering, Klassen, S. & Metz, D. (eds.): Enabling Scientific Understanding through