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Slide, Grayson Test plate with case

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Test plate rectangular glass slide with rulings under circular cover glass within yellow circle and brown border enclosed in red hinged box with blue lining. Described as “A sample Microscope slide - Test plate with rulings from 30,000 to 120,000 per inch”. This is the only surviving ruling reaching up to 120,000; hence is both unique and valuable.

Registration number: 42-2

Other numbers: On label on side: “6”

Database ID: 42

Maker's details: Ruled by H.J. Grayson.

Where made country: Australia

Where made region or state: Victoria

Where made town street other: Melbourne

Material: Slide: glass, paper Box: metal, velvet, leather

Method of production used for Museum Item: Manufactured

Size in cm (H x L x D): Slide: H0.2 x L7.5 x D3

Inscriptions and markings: Labels on slide: “Test plate 10,000 to 120,000. Ruled by H.J. Grayson, Melbourne”. No of lines per inch Band 1-10,000 2-20,000”. On label on side: “No of lines per inch Band 3 -30,000 4 - 40,000 5-50,000 6-60,000 7-70,000 8-80,000 9-90,000 10-100,000 11-110,000 12-120,000”

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Created: 12 May 2003
Authorised by: Head, School of Physics
Maintained by: Museum Curator (pslyons @