Showing 1–12 of 18 results
Chemistry: early spectroscope using prisms with graduations marking wavelengths of light
Optical spectrometer or spectroscope is an instrument used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Joseph von Fraunhofer developed the first modern spectroscope, Gustav Robert Kirchhoff and Robert Bunsen discovered the application of spectroscopes to … Continued
Refracting telescope at the observatory of Hamilton mountain in California
Achievement in technology: refracting telescope (lenses rather then mirrors) at the observatory of Hamilton mountain in California since 1888, the world’s first permanently occupied mountain-top observatory
Battery – Daniell cell – section and working asset
Middle ‘800 battery: an electric cell that produces electricity from a chemical reaction. The first battery was invented by Alessandro Volta in 1800 and then improved by Daniell in 1836
Fresnel lens (lighthouse lens) working and section
Wood engraving drawn by A. Jahandier, engraved by C. Laplante, taken from from “L’èlectricitè” by J. Baille, Paris – Hachette 1868. Multi-part lens for use in lighthouses developed by Augustin-Jean Fresnel, French physicist.
Vintage medical engraving, electric bath
Vintage engraving middle ‘800, the first electric baths were introducted at the Hopital de la Pitie in Paris by Bequerel. Many users survived and enjoyed the experience, although the physicians of that time were divided against the benefits of this … Continued
Fluids thermal expansion: the volume of a fluid increases when temperature rises
By heating a flask full of water it may be observed that as the temperature raises the water expands and its density decreases.
Archimedes’ principle experiment using a hand balance: an iron piece weights less in water then in air
Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object (Archimedes’ principle).