Slide, Grayson Test plate with case

Welcome

We acknowledge the Traditional Owners of the place now called Victoria, and all First Peoples living and working on this land. We celebrate the history and contemporary creativity of the world’s oldest living culture and pay respect to Elders — past, present and future.

Please be aware that this website may contain culturally sensitive material — images, voices and information provided by now deceased persons. Content also may include images and film of places that may cause sorrow.

Aboriginal and Torres Strait Islander people are advised that this website may contain culturally sensitive material — images, voices and information provided by now deceased persons. Content also may include images and film of places that may cause sorrow.

Some material may contain terms that reflect authors’ views, or those of the period in which the item was written or recorded but may not be considered appropriate today. These views are not necessarily the views of Victorian Collections.

Users of this site should be aware that in many areas of Australia, reproduction of the names and photographs of deceased people is restricted during a period of mourning. The length of this time varies and is determined by the community.

Reuse of any Aboriginal or Torres Strait Islander material on this site may require cultural clearances. Users are advised to contact the source organisation to discuss appropriate reuse.

Physical description

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.

Inscriptions & 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”