Henry Joseph Grayson
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 . 
<triplet> Henry Joseph Grayson <subj> 9 May 1856 <obj> date of birth <subj> 21 March 1918 <obj> date of death