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Micrometer type mechanical comparator

Micrometer type mechanical comparator

1855
Comparator made by Klett Manufacturing Co. of New York

Comparator made by Klett Manufacturing Co. of New York

Comparator by J W Lovibond Ltd

Comparator by J W Lovibond Ltd

Christa Comparator

Christa Comparator

1960-1970
Powers Interpolator Comparator Unit

Powers Interpolator Comparator Unit

Comparator by F Heilige

Comparator by F Heilige

Lovibond 1000 Comparator with p.nitro-phenol ring

Lovibond 1000 Comparator with p.nitro-phenol ring

1900-1980
Experimental measuring machine designed by E.M. Eden

Experimental measuring machine designed by E.M. Eden

1918
Comparator instrument stand made by King of Hayes

Comparator instrument stand made by King of Hayes

1939-1946
Marconi Baud-speed comparator

Marconi Baud-speed comparator

Comparator instrument stand made by King of Hayes

Comparator instrument stand made by King of Hayes

1939-1946
Prestwich fluid gauge comparator, c1917.

Prestwich fluid gauge comparator, c1917.

1916-1919
Judd-Lewis Comparator Model L46 by Hilger and Watts

Judd-Lewis Comparator Model L46

Prestwich micrometer fluid comparator 1945 to 1955.

Prestwich micrometer fluid comparator

1945-1955
Horizontal optical comparator made by Troughton and Simms: 1940-1945

Horizontal optical comparator

1940-1945
Lovibond Comparator for determining pH values of liquids. Ex RAE R50 building.

Lovibond Comparator for determining pH values of liquids

Lovibond Comparator for determining pH values of liquids. Ex RAE R50 building.

Lovibond Comparator for determining pH values of liquids

Shotter Hawkes DC/AC comparator no.A68606, British patent no.528722, made by Elliott Bros. (London) Ltd., London SE13. Inside grey painted wooden box.

Shotter Hawkes DC/AC comparator no.A68606

1960
Lovibond comparator, incomplete

Lovibond comparator, incomplete

Lovibond 1000 Comparator with p.nitro-phenol ring

Lovibond 1000 Comparator with p.nitro-phenol ring

1900-1980
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

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

Shotter Hawkes DC/AC comparator no.A68606 and Components.

1960
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