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,
Quartier des spectacles money by selling city land at below market value. Inadequate foundations, damage and wrong choice of joint sealers in 2011 also led to hundreds of thousands of dollars in repaving costs. The 100th anniversary of the birth of Norman McLaren was marked by a National Film Board of Canada project entitled “McLaren Wall-to-Wall,” in which projections of short films inspired by four McLaren animated works were projected onto landmarks in the Quartier, from McLaren’s birthday on April 11 to June 1, 2014. Quartier des spectacles Quartier des Spectacles is an arts and entertainment district located in the eastern section of