The “minute” on your phone is not a natural thing. Nothing in the sky divides an hour into 60 equal parts. Humans invented ...
“A sundial for sounding the hours,” from Athanasius Kircher’s Ars magna lucis et umbrae (Rome, 1646) (courtesy Linda Hall Library of Science, Engineering & Technology) On Time: The Quest for Precision ...
These days, you probably aren’t going to consult a sundial. But the ancient time-telling devices are all over DC, and we were curious to learn more about them. Photograph by Evy Mages.. Dedicated in ...
Educator Ruth Mork teaches kids about clocks — from sundials to cuckoo clocks to roosters. Ruth Mork introduces clocks of all kinds — sundials, candle clocks, hourglasses, cuckoos, even a rooster! She ...
Originally published: New York : Plenum Press, 1998. siris_sil_562392 ...
Timekeeping has always been one of humankind’s greatest fascinations. From observing the sun’s shadow to engineering atomic precision, the evolution of timekeeping devices spans centuries of ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Title supplied by cataloger. Historic ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results