30 x 42 in (75 x 107 cm)
ID #101462
1950 1955 250-500 Chart 26. Light charts educational foot-candle meter industrial industry information informative institutional instructional invention inverse lenses light medium mirrors Original 1955 periscope product reflection refraction schools science scientific size-29-5x42 slick coating on surface; dimensions may vary slightly with each by about a 1/4 inch telescope US United States vintage poster W. M. Welch Manufacturing Company
Sells-floto Circus
USA, C. 1915
The Barnum & Bailey Greatest Show on Earth
France, C. 1910
Hagenbeck-Wallace Circus
Indiana, C. 1915
Barnum & Bailey Greatest Show on Earth
France, C. 1900
THE HUMAN PROJECTILE
USA, C. 1920
Hunt Bros. Circus
Arizona, C. 1945