Polar clock
1845-1855
Polar clock, by W. H. Darker, Lambeth; London, mid 19th century. Wooden frame with glass semicircle inlaid with selenite that polarises sunlight according to time of day when viewed from the north.
saccharimeter (polarimeter) for use in sugar refineries by C. Scheibler
1876
saccharimeter (polarimeter) for use in sugar refineries by C. Scheibler, Berlin in Germany, 1876, invented by Mitscherlich in 1844.
Elbow projection polariscope, with accessories
1890-1900
Elbow projection polariscope, with six large slides, kaleidoscope slide and accessory slide holder with five slides, by Newton & Co., Fleet Street, London, England, 1890-1900
Pseudoscope, made by C. D. Ahrens
1845-1855
Pseudoscope, made by C. D. Ahrens, London, England, c. 1850. Consists of brass supporting stand with small leather case containing two stamped metal discs and cylindrical eyepiece unit
Abbe type Crystal Refractometer by Carl Zeiss, Jena, German, 1898
1898
Abbe crystal refractometer by Carl Zeiss, Jena in Germany, 1898
Ladd's Polariscope on iron tripod
1872
Ladd's Polariscope on iron tripod, with lens and quarter undulations plate, made by William Ladd, London, c.1872