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American patents
1852
Journal of the Franklin Institute
dlme~ican Patents which issued in June, 185"2. 83 in almost unlimited numbers, from more than thirty railways, without the most trifling casualty, or even interruption to the ordinary extensive business of that line. The author thought undue importance had been attached to the question of irregularity in the times of the trains, as an essential element of safety, for with perfect signals and a well disciplined staff, no amount of irregularity, should .lead to danger;, but,. on the.contrary, it
doi:10.1016/s0016-0032(52)90753-9
fatcat:id5zdev3bze6bfndsnht4wk4oe