Free and Discounted Ebooks
Join 150,000 readers! Get our ebook deals straight to your inbox.

On the Origin of Clockwork, Perpetual Motion Devices, and the Compass

Cover image for

Download


Published: 1959
Language: English
Wordcount: 17,353 / 61 pg
Flesch-Kincaid Reading Ease: 39.9
LoC Categories: Q, TS
Downloads: 681
Added to site: 2009.09.16
mnybks.net#: 25289
Origin: gutenberg.org
Genres: History, Post-1930

Ancestor of the mechanical clock has been thought by some to be the sundial. Actually these devices represent two different approaches to the problem of time-keeping. True ancestor of the clock is to be found among the highly complex astronomical machines which man has been building since Hellenic times to illustrate the relative motions of the heavenly bodies.This study—its findings will be used in preparing the Museum's new hall on the history of time-keeping—traces this ancestry back through 2,000 years of history on three continents.

Show Excerpt

e rising and setting of the Sun and the stars.

In the next stage, reached very soon after this, the rotation of the model was arranged to proceed automatically instead of by hand. This was done, we believe, by using a slowly revolving wheel powered by dripping water and turning the model through a reduction mechanism, probably involving gears or, more reasonably, a single large gear turned by a trip lever. It did not matter much that the time-keeping properties were poor in the long run; the model moved "by itself" and the great wonder was that it agreed with the observed heavens "like the two halves of a tally."

In the next, and essential, stage the turning of the water wheel was regulated by an "escapement" mechanism consisting of a weighbridge and trip levers so arranged that the wheel was held in check, scoop by scoop, while each scoop was filled by the dripping water, then released by the weighbridge and allowed to rotate until checked again by the trip-lever arrangement. Its action was sim

SUBSCRIBE TO MANYBOOKS 

FREE EBOOKS 

Join 150,000+ fellow readers! Get Free eBooks and book bargains from ManyBooks in your inbox. 

We respect your email privacy

(advanced)
login | register

User ID

Password

reset password

Author of the Day

Lorhainne Eckhart
A recipient of the 2013, 2015 and 2016 Readers’ Favorite Award for Suspense and Romance, Lorhainne lives on the sunny west-coast Gulf Island of Salt Spring Island, is the mother of three, her oldest has autism and she is an advocate for never giving up on your dreams. She is frequently a Top 100 bestselling author in multiple genres, and we expect that her The Outsider Series: The Complete Omnibus will also follow suit. As our Author of the Day, Eckhart talks about the Friessen men from her books, reveals which book in the omnibus was her personal favorite and talks about how important it is to schedule time to write.
Read full interview...