Zeměměřické a astronomické přístroje používané na území ČR od 16. do konce 20. století
Charles Frodsham and Co. was founded in 1843 in London. In 1851 she exhibited at the Great Exhibition. From 1892 Charles Frodsham and Sons were holders of the Royal Warrant for chronometers, clocks and watches. The company still exists today.
The manufacturer's name on the device