The Wizard Catalogue 1899, Manhattan Optical Co., p. 30
In 1891, Gundlach offered six field-type lens formulae, five of which were rapid rectilinear types and one single achromatic type. They were the: Gundlach Rapid Rectigraphic Lens, Gundlach Perigraphic Lens, Gundlach Wide Angle Lens, Gundlach Star Lens, Gundlach Star Wide Angle Lens and Gundlach Single Achromatic Lens.
References:
Photographic Lenses, Cameras and Supplies, Manhattan Optical Co.
(Cresskill, N.J.), April 1896, p. 27
The Wizard Catalogue 1899, Manhattan Optical Co. (Rochester, NY),
p. 30