Old Galileo thermometer

Now we see Galileo ball thermometer is according to the Italian scientist Galileo & middot; Ng riley ( 伽利略) Thermometer for improvement in the early 17th century invention, this is a more ancient thermometer. Each glass bulb connected with a small metal tag indicating temperature. Symbols engraved with a number on the label and temperature. The balance of the fact that the metal label are calibrated. The weight of each label are slightly different with the other. As a result of these glass bubble is blow made by hand, they have different size and shape. The glass bulb is through to join a certain amount of liquid which has the same density method for calibration. Therefore, after weight of label on the connection, the density of each glass bulb ( The quality of volume And other glass bubble is slightly different, and the density of all glass bubble is very close to the density of water around them. Because of the finiteness of ball number, the Galileo thermometer can measure the temperature range in 18 ~ 26 ℃ or so commonly, ball the more the greater the measurable temperature range. And winter indoor temperature below 18 ℃, usually all ball sinking; Summer indoor temperature generally higher than 26 ℃, all ball float. To accurately measure indoor temperature, or need special procurement indoor thermometer.