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,
Charlotte (1784 ship) Charlotte (1784 ship) Charlotte was an English merchant ship built in the River Thames in 1784 and chartered in 1786 to carry convicts as part of the First Fleet to New South Wales. She returned to Britain from Botany Bay via China, where she picked up a cargo for the British East India Company. "Charlotte" then spent much of the rest of her career as a West Indiaman in the London-Jamaica trade. She may have been lost off Newfoundland in 1818; in any case, she disappears from the lists by 1821. "Charlotte" was a "heavy sailer," such that she had