The National Geographic Magazine, Volume 92National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 400
... watch is accurate to an extent undreamed of by the early makers of watches and clocks . Today's average watch does not vary by more than 10 or 12 seconds a day . A good watch has a hairspring that vibrates 18,000 times an hour . If it ...
... watch is accurate to an extent undreamed of by the early makers of watches and clocks . Today's average watch does not vary by more than 10 or 12 seconds a day . A good watch has a hairspring that vibrates 18,000 times an hour . If it ...
Page 422
... watches in Memorial Hall , Philadelphia , is the clock - watch believed to have been made by Peter Henlein and to be the oldest portable clock - watch in existence ( page 424 ) . This was the first attempt to get the works of a clock ...
... watches in Memorial Hall , Philadelphia , is the clock - watch believed to have been made by Peter Henlein and to be the oldest portable clock - watch in existence ( page 424 ) . This was the first attempt to get the works of a clock ...
Page 426
... Watch Company , was the first in the world in which all parts of a watch were made by machinery under the same roof . Its success revolutionized the methods of watchmaking not only in America but also , to a less degree , in all parts ...
... Watch Company , was the first in the world in which all parts of a watch were made by machinery under the same roof . Its success revolutionized the methods of watchmaking not only in America but also , to a less degree , in all parts ...
Contents
Adventures with the Survey Navy By Irving Johnson 131 | vi |
Delhi Capital of a New Dominion By Phillips Talbot With 20 illustrations in color | xiv |
Exploring Americas Great Sand Barrier Reef North CarolinaVirginia By Capt | xx |
Copyright | |
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