Harold Dennis Taylor (10 July 1862, in Huddersfield – 26 February 1943) was a British optical designer and inventor, chiefly famous for the invention of the Cooke Triplet, although he was granted about 50 other patents. He was born in 1862 in Huddersfield, attended St Peter's School, York, and began the study of architecture. Circa 1880, he abandoned this to work at Thomas Cooke and Sons of York, a company which produced the finest quality optical instruments, telescopes in particular. * Cooke triplet *