Egner Frederic (1 results)

Condition: Good. Patent document, partially filled with manuscript notes; 11 1/2 x 7 1/2; off-white card stock - hand-colored engravings and manuscript notations to recto, specification to verso; two lower corners clipped, obscuring part of a penciled-in word; thin chip with small loss of paper to upper right corner; later typed label to upper left corner; a bit of smudging to margins; overall in good to very good condition.An interesting engineering piece, it was created by one Frederic Egner, a noted engineer from St Louis, MO, who had also worked for the People's Gas Light and Coke Company in Chicago in the early 1880s, consulting, designing, and patenting several other apparatus - for water gas, etc. The current one appeared to have imroved and novel features. Illuminating gas, a mixture of combustible gasses, including methane, carbon oxide, and hydrogen, formed during thermal processing of coal, was widely used for gas lighting through the 19th- and early-20th centuries.