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Micrometer type mechanical comparator

1855

Experimental measuring machine designed by E.M. Eden

1918

Comparator instrument stand made by King of Hayes

1939-1946

Christa Comparator

1960-1970

Marconi Baud-speed comparator

Comparator by F Heilige

Comparator instrument stand made by King of Hayes

1939-1946

Comparator by J W Lovibond Ltd

Comparator made by Klett Manufacturing Co. of New York

Horizontal optical comparator made by Troughton and Simms: 1940-1945

Horizontal optical comparator

1940-1945
Prestwich micrometer fluid comparator 1945 to 1955.

Prestwich micrometer fluid comparator

1945-1955
Comparator, from the portable laboratory owned by Dr. H.G Butterfield, by Hawksley, London, England, 1930-1940

Comparator, from the portable laboratory owned by Dr. H.G Butterfield

1930-1940
Prestwich fluid gauge comparator, c1917.

Prestwich fluid gauge comparator, c1917.

1916-1919
Shotter Hawkes DC/AC comparator no.A68606, British patent no.528722, made by Elliott Bros. (London) Ltd., London SE13

Shotter Hawkes DC/AC comparator no.A68606

1960
Lovibond comparator, incomplete

Lovibond comparator, incomplete

Lovibond Comparator with disc for residual chlorine in water and 4 spare tubes and booklet of instruction. In leather case. Together with 2 discs, phenol red, for pH 7.0 - 8.9 and many spare tubes

Lovibond Comparator with Disc for Residual Chlorine in Water

Lovibond 1000 Comparator with p.nitro-phenol ring

Lovibond 1000 Comparator with p.nitro-phenol ring

1900-1980
Judd-Lewis Comparator Model L46 by Hilger and Watts

Judd-Lewis Comparator Model L46