A voyage in space; a course of six lectures "adapted to a juvenile auditory" delivered at the Royal Institution at Xmas 1913 (1915)
Turner, Herbert Hall, 1861-1930 · London Society for Promoting Christian Knowledge · leaf 101
ay seem surprising that anything so soft andthin as air can produce the same effect by frictionas we get from hard wood, but we can actually proveit by experiment. Sir James Dewar devised this in-genious apparatus to do so (Fig. 21). A wooden armAB can be spun about the end A. The end B thusrushes… … Fig. 21. THE LENGTH OF OUR VOYAGE 81 it and even show it to you on the screen; and themethod is this : we join two wires of different metalsat both ends, and put one junction at the end A ofthe spinning bar and the other at the end B. Nowit is a well-known fact that if one of these junctionsbe…
Astronomy -- Juvenile literature
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
