Inventions by Benjamin Franklin

metal rod or metallic object to protect from lightning

musical instrument

thumb|A bifocal lens with areas of differing magnification thumb|Bifocals with separate lenses. In this case, the Swedish ethnologist . Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.

began with the delivery of stampless letters

type of fireplace

scientific instrument demonstrating electric charge