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,
1st American Regiment (1783–1784) 1st American Regiment (1783–1784) 1st American Regiment, also known as Jackson's Continental Regiment of 1783-1784, was the last unit in the Continental Army, retained after the close of the American Revolutionary War. This regiment, under the command of Colonel Henry Jackson of Massachusetts, was not the same unit as Jackson's Additional Continental Regiment of 1777, which had become the 16th Massachusetts Regiment in 1780 and had been disbanded in 1781. Equally, this regiment should not be confused with the First American Regiment of 1784-1791, which was originally commanded by Colonel Josiah Harmar, has remained in service to the present, and