An example of Daniell’s Pyrometer manufactured by Knight and Sons, London [1839-1877]- in good condition in original mahogany case. John Frederic Daniell [1790-1845] most famous for invention of the Daniell Cell and the Dew-point Hygrometer.
described his pyrometer in Phil. Trans 1830, an example in Science Museum London ref-1976-534
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Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.