Alexander R. Beckers. Beckers first saw a daguerreotype in Philadelphia, and subsequently went to work there for photographer Frederick David Langenheim in 1843. The following year he moved to New York, where he is credited with the first whole-plate daguerreotypes made in that city. Within months Beckers opened the Langenheim & Beckers studio in New York, which became Beckers & Piard in 1849. In 1857 he patented a revolving stereograph viewer and shortly thereafter sold his daguerreotype business in order to concentrate his attention on the manufacture of stereograph viewers.