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The wood framed hygrometer includes a comfort zone indication and a glass face dial.
The Galileo thermometer consists of a sealed glass tube that is filled with fluid (paraffin oil) and several floating bubbles. The bubbles are glass spheres filled with a colored liquid mixture.
Attached to each bubble is a little metal tag that indicates a temperature. These metal tags are 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.
As the temperature of the air outside the thermometer changes, so does the temperature of the fluid surrounding the bubbles. As the temperature of the fluid 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 bubble that sinks the most indicates the approximate current temperature.
The concept that 'decreasing atmospheric pressure predicts stormy weather' was postulated by Lucien Vidie, and it is the basis for a weather prediction device called a storm glass or liquid barometer. It consists of a glass container with a sealed body, half filled with water.
A narrow spout connects to the body below the water level and rises above the water level, where it is open to the atmosphere. When the air pressure is lower than it was at the time the body was sealed, the water level in the spout will rise above the water level in the body and when the air pressure is higher, the water level in the spout will drop below the water level in the body.
I got my husband this for his birthday and he loves it, and so do I!
The wooden stand does not seem to be milled properly and the glass globe does not fit in the base, at least in the one I received.
This is a great office gift for her or him and looks very nice though the wood is not the highest quality.
got it for x-mas gift for my mother in laws boy friend who very much into astrology and stars an stuff he loved it came on time and not brokenPublished 21 days ago by K. castonguay
This was purchased as a gift for Christmas. The recipient was/is thrilled with it!Published 25 days ago by Cindy Harrington
Very nice, haven't filled the one thing with the colored water yet but I really like this. You need to be careful though because the two glass parts are not permanently attached... Read morePublished 1 month ago by Sheila A. Little
Very satisfied with the Ambient Weather Station that included Galileo Thermometer, Hygrometer, and Global Glass Fluid Barometer. Read morePublished 1 month ago by bowmance