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Sextant Listen The sextant was and still is a navigational instrument. It evolved from the ancient octant (eigth part of the circumference of a circle) and is used to measure the angular difference be

Galileo telescope Listen The Galilean telescope is realized with a convergent objective lens and a divergent eyepiece lens. Consequently, the image of the object appears in an upright position. Thus,

Litrameter Listen Robert Hare was a lecturer in chemistry at Pennsylvania University. His litrameter was represented in science periodicals of both the old and new world. By his own account he used st

Sikes's Hydrometer Listen The hydrometer is a measurement device to determine the mass density of liquids. It was developed in the early 19th century and put to use by the British Customs Services to

Hydrostatic Balance on the model of 's Gravesande Listen 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

Galileo's Inclined Plane Experiment Listen Galileo's inclined plane is a wooden beam of approximately 6,7m length the top of which has a hemicircular vellum-bound notch. The vellum is used in order to

Demonstration device for the parabolic flight curve according to ‘sGravesande Listen The demonstration device according to 'sGravensande and van Musschenbroek is first mentioned in the 1742 edition of

Mouchot's Solar Heater Listen The Solar Heater on the model of Mouchot is a heliothermal engine by which food or water can be heated by solar radiation. Augustin Mouchot developed a string of heliothe

Geiger Müller counter tube Listen The Geiger Müller counter tube is one of the earliest measurement devices for the field of radioactivity. Walter Müller developed it under the auspices of his thesis

Millikan's apparatus for the determination of the elementary charge Listen From 1909 until 1911 Robert A. Millikan together with his assistant Harvey Fletcher conducted experiments to determine the el