MOMENTAN AUSVERKAUFT
Über dieses Produkt
Product Identifiers
PublisherHarperCollins
ISBN-100060910666
ISBN-139780060910662
eBay Product ID (ePID)19384
Product Key Features
LanguageEnglish
TopicClocks & Watches, Non-Classifiable, Antiques & Collectibles
AuthorJames Smith Rudolph
IllustratorYes
Dimensions
Item Height0.4 In.
Item Length12.1 In.
Item Weight13.3 Oz
Item Width9.6 In.
Additional Product Features
Publication Year2001
LCCN83-047570
FormatTrade Paperback
Book TitleMake Your Own Working Paper Clock
Intended AudienceTrade
SynopsisClocksby 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, Cut this book into 160 pieces, glue them together, and have a paper clock operated by weights that keeps perfect time and can be rewound and regulated.
Number of Pages40 pages
Bewertungen und Rezensionen
Relevanteste Rezensionen
- 09. Jan. 2022
An amazing project for those with patience
This book is exactly what the title says. Sit down with an x-acto knife and a lot of patience, and the result will be a working, ticking clock made of paper. If you attempt the project, allocate a workspace that won't be used for anything else and where the kids and cat can't scatter pieces. Gluing the gearwheels, for example, takes several days and must be done piece by piece - and there are dozens of individual, small pieces. Figure on two months to complete it working two hours a day.Bestätigter Kauf: Ja
- 08. Mär. 2017
Review
Is not an easy project but is a great itemBestätigter Kauf: JaArtikelzustand: Gebraucht
- 10. Mai. 2019
Excellent experience
Very fast, easy to work with, and the very best price possibleBestätigter Kauf: JaArtikelzustand: Gebraucht
- 28. Apr. 2022
relogio diferente , imprecionante
ainda não montei , mas é exatamente o que eu esperava , recomendoBestätigter Kauf: Ja
