is called a Galileo thermometer. A simple, fairly accurate thermometer, today it is mostly used as decoration. The Galileo thermometer consists of a sealed glass tube that is filled with water and several floating bubbles. The bubbles are glass spheres filled with a colored liquid mixture. This liquid mixture may contain alcohol, or it might simply be water with food coloring. An object immersed in a fluid experiences two major forces: the downward pull of gravity and the upward push of buoyancy. It is the downward force of gravity that makes this thermometer work. Attached to each bubble is a little metal tag that indicates a temperature. A number and degree symbol are engraved in the tag. These metal tags are actually calibrated counterweights. The weight of each tag is slightly different from the others. Since the bubbles are all hand-blown glass, they aren't exactly the same size and shape. The bubbles are calibrated by adding a certain amount of fluid to them so that they have the exact same density. So, after the weighted tags are attached to the bubbles, each differs very slightly in density (the ratio of mass to volume) from the other bubbles, and the density of all of them is very close to the density of the surrounding water. The basic idea is that as the temperature of the air outside the thermometer changes, so does the temperature of the water surrounding the bubbles. As the temperature of the water changes, it either expands or contracts, thereby changing its density. So, at any given density, some of the bubbles will float and others will sink.andnbsp;The lowest bubble in the top set of bubblesandnbsp;indicates the approximate current temperature. Consider this example: Let's say there are five bubbles in  (less)

that date back to 1958, the company continues to bring new time and temperature technologies to the market today and to expand the application of its products into new markets. Balmoral Antique Copper Clock and thermometer white color dial with Arabic numbers and black hands.Using the same technology NASA employs to tell time, Atomix clocks wirelessly synchronize with the National Institute of Standards and Technology's atomic clock in Boulder, Colorado. In addition to daily confirming the time, these clocks automatically adjust for Daylight Saving Time and run up to two years on a single AA battery. No wires, no worries, and no more excuses for being late. 20 X 20 X 4  (less)

tube become  (less)

mostly used as decoration. The Galileo thermometer consists of a sealed glass tube that is filled with water and several floating bubbles. The bubbles are glass spheres filled with a colored liquid mixture. This liquid mixture may contain alcohol, or it might simply be water with food coloring. An object immersed in a fluid experiences two major forces: the downward pull of gravity and the upward push of buoyancy. It is the downward force of gravity that makes this thermometer work. Attached to each bubble is a little metal tag that indicates a temperature. A number and degree symbol are engraved in the tag. These metal tags are actually calibrated counterweights. The weight of each tag is slightly different from the others. Since the bubbles are all hand-blown glass, they aren't exactly the same size and shape. The bubbles are calibrated by adding a certain amount of fluid to them so that they have the exact same density. So, after the weighted tags are attached to the bubbles, each differs very slightly in density (the ratio of mass to volume) from the other bubbles, and the density of all of them is very close to the density of the surrounding water. The basic idea is that as the temperature of the air outside the thermometer changes, so does the temperature of the water surrounding the bubbles. As the temperature of the water changes, it either expands or contracts, thereby changing its density. So, at any given density, some of the bubbles will float and others will sink.;The lowest bubble in the top set of bubbles indicates the approximate current temperature. Consider this example: Let's say there are five bubbles in the thermometer: A blue bubble that represents 60 degrees /liA y  (less)

F Indoor/Outdoor Humidity Range: 20-90% Min/Max Memory on Temp. and Humidity Atomic Clock with Alarm and Snooze Month Date and Day of the Week Calendar Moon Phase Low Battery Indicator for Main Unit and Remote 3Channel Capable  (less)

with WWVB signal and will automatically reset for DST.  (less)

your alarm settings in the event of a power failure. Hit the snooze if you want to shut off your engine and coast a couple more laps. The alarm gives you the choice of the roar of a muscle car, motorcycle, sports car or a gentle ding. Adjust the backlight from completely off to brightest intensity.  (less)

display  (less)

that date back to 1958, the company continues to bring new time and temperature technologies to the market today and to expand the application of its products into new markets.Summit Large case with an aged gold finish. Large dial with black Arabic numbers and black metal hands. Glass lens.22.5 X 19 X 9.5  (less)

and a knife counts the minutes until dinner. Easy-to-read white face also has a sweep second hand; perfect for dining rooms, kitchens, and eating nooks. Uses one AA battery (not included). Metal and glass. Imported. 10-3/4" dia.  (less)

lbs., Manufacturer: Chaney Instruments  (less)

series of ridges on the interior...  (less)

of ridges on the interior...  (less)

pale blue shadow effect;...  (less)