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Make Your Own Working Paper Clock by James Smith Rudolph: Used

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Bevindt zich in: Sparks, Nevada, Verenigde Staten
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eBay-objectnummer:364043750834
Laatst bijgewerkt op 06 apr 2024 13:57:45 CESTAlle herzieningen bekijkenAlle herzieningen bekijken

Specificaties

Book Title
Make Your Own Working Paper Clock
Format
Trade paperback
Publication Date
2001-08-21
Publication Year
2001
Pages
40
ISBN
9780060910662
Language
English
Author
James Smith Rudolph
Publisher
HarperCollins
Topic
Clocks & Watches

Over dit product

Product Information

Clocksby Isaac AsimovThrough most of history, people hardly felt the need of clocks. It seemed sufficient to consult one's own physiology to tell when one was hungry or sleepy, or to observe the general position of the sun in the sky during the day or that of the Big Dipper at night.Those who were meticulous enough to want something better searched for some regular motion that existed in nature or that could be contrived. In ancient times, the sundial was invented so that the passage of the shadow of a rod could be followed as the sun crossed the sky.Or else one could observe the extent to which a candle burned downward, or wait till a certain amount of sand had sifted through a small opening. Such devices could be used on cloudy days or at night, when the sun could not be seen and shadows were not observed.In ancient times, the best timepiece was the clepsydra, or water clock, which measured time by the regular dripping of water through a narrow opening. As water accumulated in the lower reservoir, a float carrying a pointer rose and marked the hours. The best water clocks were quite elaborate but few in number and fragile. They could not be relied on to tell time more closely than a fairly large fraction of an hour.In medieval Europe, the mechanical clock was invented. Clever arrangements of gears and wheels were devised that could be made to turn by weights attached to them. As the weights were pulled downward by the force of gravity, the wheels were forced to turn in a slow, regular manner. A pointer, properly attached to the wheels, marked the hours.These mechanical clocks were less delicate than water clocks and required less maintenance. They became commonin churches and monasteries and could be relied on to tell when to toll the bells for regular prayers or church attendance. (The very word "clock" is from the French cloche, meaning "bell.")Eventually, mechanical clocks

Product Identifiers

Publisher
HarperCollins
ISBN-10
0060910666
ISBN-13
9780060910662
eBay Product ID (ePID)
19384

Product Key Features

Author
James Smith Rudolph
Language
English
Topic
Clocks & Watches

Dimensions

Item Length
12.1in
Item Height
0.4in
Item Width
9.6in
Item Weight
13.3 Oz

Additional Product Features

Book Title
Make Your Own Working Paper Clock
Format
Trade Paperback
Lccn
83-047570
Intended Audience
Trade
Publication Year
2001
Illustrated
Yes
Genre
Non-Classifiable, Antiques & Collectibles
Number of Pages
40 Pages

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