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Henry Joseph Grayson (9 May 1856 – 21 March 1918) was a British-born Australian nurseryman and scientist, best known as the designer of a machine for ruling diffraction gratings.
Grayson was born in Worrall, near Sheffield, son of Joseph Grayson, a Master Cutler, and his wife Fanny, née Smith. He travelled to New Zealand in the early 1880s. After he returned to England and married Elizabeth Clare on 11 August 1886, the couple soon migrated to Victoria (Australia) where Grayson worked as a nursery gardener. Becoming interested in science he joined the Field Naturalists Club of Victoria, studied botany and did some work on the diatoms, a group of minute plants. Grayson attended meetings of the Royal Microscopical Society and developed a talent for preparing microscope slides.
Before 1894 he had constructed a machine for making micrometer rulings on glass, the results being very good for that time. Grayson had by then succeeded in creating 120,000 diffractions lines to the inch (4,700 lines/mm).
The above information is a brief extract from the Wikipedia entry.