Image: Kirks Soap Yerkes Mars
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Description: 1893 ad from a Chicago newspaper for "Kirk's Soap". The ad plays on the opening that year of the Yerkes Observatory's 1-meter (40-inch) refracting telescope (the largest of its type in the world), and the idea that Mars was populated with intelligent life.
Title: Kirks Soap Yerkes Mars
Credit: Contemporary Astronomy â second edition, by Jay M. Pasachoff, published by Saunders College Publishing 1981. ISBN 0-03-057861-2
Author: Further attribution given within to "American Institute of Physics, Niels Bohr Library". 1893 ad its self is attributed in text to an unnamed Chicago newspaper.
Permission: PD-US.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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