Tinsley Polarograph Type 19/21 made by Elliott Bros (London) Ltd. Dates from c. 1964-69. Serialnumber QC 2452 Tinsley Polarograph Type 19/21 1964-1969
Polarograph: A.1660 Davis differential cathode ray polarograph and A.1661 electrode stand with standard accessories; serial nos A1160/697; A1661/787 Davis differential cathode ray polarograph and electrode stand 1965