Time gives his hour-glass
Its due reversal.
Their hour is gone.
MATTHEW ARNOLD, "Consolation"
Hourglass History
Hourglass - measurement device
The Hourglass, sand glass, sand timer or sand clock
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the intervals of time
It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material (historically sand) from the upper bulb to the lower one. Factors affecting the time interval measured include sand quantity, sand coarseness, bulb size, and neck width. Hourglasses may be reused indefinitely by inverting the bulbs once the upper bulb is empty.
Hourglass fact:
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Before it became the symbol of a program stalling on your PC, the hourglass spent centuries as the representation of mortality and an emblem of the sciences. Much more than a symbol, of course, it also kept track of time in the pre-Swatch Era. See Time symbolism, Hourglass symbolism.
See also Largest Hourglass
This 1338 fresco showing the personification of Temperance is the first known depiction of an hourglass in either art or letters.
Ambrogio Lorenzetti 1338 hourglass
So basically all the evidence points to the hourglass being invented around 1000-1100 AD, during that era's great advances in maritime navigation. This dating gives the hourglass roughly enough time to become widely used and to enter the material record around 1300.Not everyone, however, is convinced.
The Hourglass, Hourglass History
The origin of the hourglass is unclear
Hourglass History
Its predecessor the clepsydra, or water clock, is known to have existed in Babylon and Egypt as early as the 16th century BCE. According to the Journal of the British Archaeological Association the so-called clepsammia were in use before the time of St. Jerome (335 CE), and the first potential representation of an hourglass is in a sarcophagus dated c. 350 CE, representing the wedding of Peleus and Thetis, discovered in Rome in the 18th century, and studied by Winckelmann in the 19th century, who remarked the hourglass held by Morpheus in his hands.
However, it is disputed whether object in question is a clepsammia or a similarly-shaped clepsydra; no other hourglass clearly appears in the historical record for another thousand years. Wiki
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Father Time – Time personified as an old bearded man, usually carrying a scythe and an hourglass
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Hourglass 264, Father Time, post card
The hourglass first appeared in Europe in the eighth century, and may have been made by Luitprand, a monk at the cathedral in Chartres, France. By the early fourteenth century, the sand glass was used commonly in Italy. It appears to have been widely used throughout Western Europe from that time through 1500.
The hourglass or sand clock follows exactly the same principle as the clepsydra. Two globes (also called phials or ampules) of glass are connected by a narrow throat so that sand (with relatively uniform grain size) flows from the upper globe to the lower.
Hourglasses were made in different sizes based on pre-tested measurements of sand flow in different sizes of globes. A housing or frame that enclosed the globes could be fitted to the two globes to form a top and bottom for the hourglass and was used to invert the hourglass and start the flow of sand again. Some hourglasses or sets of hourglasses were set in a pivoted mount so they could be turned easily.
Hourglass 259, post card
See also Father Time and Mother of Time
Design and conceptualization are usually the most complicated part of hourglass making. The hourglass maker must be craftsman, artist, and public relations expert in advising clients of the practicalities in hourglass design and construction. Businesses are commissioning hourglasses as gifts related to the year 2000, but they also want to reflect the character of their business or incorporate materials associated with their products. After the design is finalized, actual construction of the hourglass is relatively straightforward.
Hourglass 250-255, post cards, Hallmark
Sand-clock designs can also vary considerably in size. The smallest known hourglasses are the size of a cufflink, and the largest are up to 3 ft (1 m) tall. The glasses can have various shapes from round to oblong and can be engraved. Multiple (more than two) glass gloves can be linked together, and several hourglasses can be mounted in the same frame and turned on a turnstile.
Big Hourglass, Time Symbol
Shimane hourglass recognized by Guinness as world’s largest
One ton of the sand is designed to fall through the glass container over a year…
The Hourglass, Hourglass History
THE HOURGLASS
by John H. Lienhard
Click here for audio of Episode 1469.
Today, let's look at the hourglass. The University of Houston's College of Engineering presents this series about the machines that make our civilization run, and the people whose ingenuity created them.
Hourglass Banksy
The Hourglass, Hourglass History Resources
Branley, Franklyn M. Keeping Time: From the Beginning and into the Twenty-first Century. Boston: Houghton Mifflin Company, 1993.
Cowan, Harrison J. Time and Its Measurement: From the Stone Age to the Nuclear Age. New York: The World Publishing Company, 1958.
Guye, Samuel and Henri Michel. Time & Space: Measuring Instruments from the Fifteenth to the Nineteenth Century. New York: Praeger Publishers, 1970.
Smith, Alan. Clocks and Watches: American, European and Japanese Timepieces. New York: Crescent Books, 1975.
The Journal of the British Archaeological Association, Volume 29
Morris, Scot. "The floating hourglass." Omni (September 1992): 86.
Peterson, Ivars. "Trickling sand: how an hourglass ticks." Science News (September 11, 1993): 167.
Hourglasses on the Library of Congress
Balmer, R.T. The operation of sand clocks and their medieval development. Technology and culture, v. 19, Oct., 1978: 615-632
Turner, A.J. The accomplishment of many Years: Three notes towards a history of the sand glass. In Of time and measurement: studies in the history of horology and fine technology by A.J. Turner, Brookfield, VT, Variorum, c1993. p. 161-172
Sternfeld, Joseph. Hourglasses. National association of watch and clock collectors bulletin. Supplement: 1953.
Brackin, A.J. Clocks: Chronicling time (Series: The Encyclopedia of discovery and invention). San Diego, CA, Lucent Books, c1991. 96 p. (Juvenile)
The Hourglass, Hourglass History
Here are the other factors that affect the accuracy of an hourglass:
The amount or volume of sand usedThe size and angle of the glass bulbsThe quality of the sand or granular material. It must be fine, dry and consistently formed so it can flow smoothly. (Some substances used in the past were fine grain sand, powdered eggshells, and powdered marble.)The width of the neckA tight seal so no moisture can get into the chambers. Moisture can add weight to the sand or clog up the neck.A flat and level surface on which to rest the hourglass
The Hourglass Manufacturing Process
After the design and materials are selected, the body of the hourglass is blown on a glass lathe to a size appropriate for the size (time interval) of the hourglass.The frame is made; depending on its design, it may be a single piece or multiple pieces including a bottom, top, and three or four posts. This manufacture depends on the material. If the frame is made of resin, molds may be constructed, the resin is poured in and allowed to cure, the pieces are sanded or otherwise smoothed and polished, and they are fitted together. Frame pieces may be fitted to interlock; or they may be glued, bonded, or welded, again depending on the materials involved.One of the most common misconceptions about hourglasses is that there is a formula for the quantity of sand contained in the glass. The sand quantity in a given hourglass design or shape is not based on science or a measurement formula. The types of grains, the curves of the glass, and the shape and size of the opening impose too many variables on the rate of flow of the sand through the glass, so the amount of sand can not be mathematically calculated. Before the top of the frame is sealed, sand is added and allowed to flow through the glass for its prescribed time interval. At the end of that time period, sand remaining in the top of the glass is poured off and the glass is sealed.
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Really Big Hourglass
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