One of two cases for three prism spectroscope made by Troughton and Simms
One of two cases for three prism spectroscope made by Troughton and Simms, London, for the Royal Society in 1867. Case No.1 [1' 3 1/4" x 1' 3 1/4" x 1' 6"] lock but no key
Three prism solar spectroscope with equatorial mounting engraved 'Royal Society - 1867', made by Troughton and Simms, London, in two cases
One of two cases for three prism spectroscope made by Troughton and Simms, London, for the Royal Society in 1867. Case No.1 [1' 3 1/4" x 1' 3 1/4" x 1' 6"] lock but no key
One of two cases for three prism spectroscope made by Troughton and Simms, London, for the Royal Society in 1867. Case No.2, [1' 3 1/4" x 1' 8"] in bad condition, no lock or key
Three prism spectroscope with equatorial mounting engraved 'Royal Society - 1867', made by Troughton and Simms, London.