Group of Cast Iron & Brass Scientific Apparatus, 19th/20th Century,
A Robert Muencke of Berlin, Germany, optical spectrum projector, likely dating from the early 20th century used for physics or chemistry demonstrations and experiments. It features a rectangular housing constructed from blackened metal, possibly iron or steel, designed to contain and focus a light source; a Wm Gaertner of Chicago acoustic instrument including a 440 tuning fork designed for demonstrating acoustic resonance; a 90 degree protractor quadrant on rod; with other instruments on tripod or flat bases.

Largest Dimensions: H: 13 1/2 x W: 7 1/2 x D: 7 1/2 in.

O'Connor, R. T., William Gaertner, 1864-1948, in Popular Astronomy, Vol. 57, pp.65-68. General grime, wear and areas of paint loss. All lots have imperfections or the effects of aging. Gray's Auctioneers shall have no responsibility for any errors or omissions.