The seven follies of science; a popular account of the most famous scientific impossibilities and the attempts which have been made to solve them. To which is added a small budget of interesting paradoxes, illusions, and marvels (1906)
Phin, John, 1830-1913 · New York, D. Van Nostrand company · leaf 157
146 THE SEVEN FOLLIES OF SCIENCE hereafter the ordinary methods of searching suspected spies will have to be exchanged for one that is more efficient. The most interesting application of microphotography, of which we have any record, occurred during the Franco- Prussian war in 1870-71. On September… … Fig. 21. roads, railways, and telegraphs, was cut off and the only way of escape from the city was through the air. On April 23, the first balloon left Paris, and in a short time after that, a regular balloon post was established, letters and packages being sent out at intervals of three to seven…
Scientific recreations · Geometry
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
