Optician more important and dignified. Far-sighted or aging colonial Americans imported spectacles from Europe. Spectacles were primarily for the affluent and literate colonists, who required a valuable and precious appliance. Benjamin Franklin in the 1780s developed the bifocal. Bifocal lenses advanced little in the first half of the 19th century. The terms bifocal and trifocal were introduced in London by John Isaac Hawkins, whose trifocals were patented in 1827. In 1884 B. M. Hanna was granted patents on two forms of bifocals which become commercially standardized as the "cemented" and "perfection" bifocals. Both had the serious faults of ugly appearance, fragility,
HMS Tremendous (1784) "Experiment", carrying iron, "Columbus", carrying linseed, "Neptunus", carrying timber, and "Hector", carrying sundry goods, came into Yarmouth. They were prizes to "Tremendous", , , , , . and . In 1845 she was reduced to a 50-gun ship, and renamed HMS "Grampus". "Grampus" became a powder hulk in 1856, and was eventually sold out of the service in 1897. Citations HMS Tremendous (1784) HMS "Tremendous" was a 74-gun third rate ship of the line of the Royal Navy, launched on 30 October 1784 at Deptford. Throughout May 1794 "Tremendous", whilst under the command of Captain James Pigott, participated in the