Curt Herzstark - Curt Herzstark Contina AG Mauren Curta serie 1 (1955) - Taschenrechner - 1955
Nr. 33609729
Original Crookes Radiometer der ersten Serie Anfang 1900 (1) - Glas, Leichtmetall - Anfang des 20. Jahrhunderts
Nr. 33609729
Original Crookes Radiometer der ersten Serie Anfang 1900 (1) - Glas, Leichtmetall - Anfang des 20. Jahrhunderts
Original Crookes radiometer, first series, 1900.
The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside.
The vanes, built with light metal, rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.
It was invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research.
The radiometer on auction, unlike some imitations with a slight bump on top, has a perfectly rounded glass bulb.
Dimensions: 140x80x80 mm
PRO insured shipping with proper material (sturdy hard box, 1 cm polystyrene layer on all sides of the box, protective film and 200 g bubble wrap to protect your parcel from shocks and falls).
The item of this auction will be shipped via DHL/NEXIVE.
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