View of a Brewster's Fringe Apparatus

Brewster's Fringe Apparatus (Circa 1844: 30 cm brass tube with a variable slit at one end and two glass windows at the other.  The two windows are connected by a hinge (see figure) so the the angle between them may be varied.  The figure and discussion are in Pouillet's 'Elements de Physique,' Tome 2, page 36) and Plate 40, Fig 25, probably procured around 1875.), Credit Line: U.S. Military Academy, courtesy of AIP Emilio Segrè Visual Archives
Abstract/Description: Brewster's Fringe Apparatus (Circa 1844: 30 cm brass tube with a variable slit at one end and two glass windows at the other. The two windows are connected by a hinge (see figure) so the the angle between them may be varied. The figure and discussion are in Pouillet's 'Elements de Physique,' Tome 2, page 36) and Plate 40, Fig 25, probably procured around 1875.)
Subject(s): Equipment and supplies
Instruments
West Point (N.Y.)
United States Military Academy
Credit Line: U.S. Military Academy, courtesy of AIP Emilio Segrè Visual Archives
Catalog ID: US Military Academy F7