A selection of Grayson rulings on twelve glass slides
Henry Joseph Grayson (b.1856, d.1918)
In microscopy, calibration of the field of view and the quantitative test of objectives require test rulings. Grayson made an entirely new micro-ruling machine for making micrometer rulings on glass. The early version of this machine was mainly of glass and wood. In 1897 some beautiful work Grayson had done in cutting sections of plants led to a position in the physiology department of the University of Melbourne under Professor C. J. Martin.
Twelve glass slides, an example of Grayson's talent in preparing microscope slides, both biological and petrological.
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