File:Voyage in Space page044.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:37, 19 December 2015 | 1,340 × 340 (23 KB) | Keith Edkins | {{Information |Description={{en|1=An oscillating system with a variable period (unlike a pendulum).}} |Source=A Voyage in Space[https://archive.org/details/voyageinspacecou00turnrich]. |Author=Herbert Hall Turner |Date=1913 |Permission= |other_version... |
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