First individual thermometer
The first individual thermometer was invented by Galileo in the 16th century. However, it was not until 300 years later that a thermometer that was easy to use and reliable in performance was designed.
Mercury is stored in the mercury ball at the end. When mercury is heated, it expands and rises along a very narrow glass tube. Therefore, small changes in body temperature will lead to a significant increase in mercury in the glass tube. After measuring the body temperature, you have to force the thermometer to return the mercury to the mercury ball.
In 1714, Gabriel Warrenhite developed a mercury thermometer that sets the scale within the freezing point of water and the temperature range of the human body. A Dutch doctor used it to give a fever to a patient, but the thermometer is still too big and most doctors are not using it very quickly.
In 1868, the German professor Wendrich published the book "Disease and Body Temperature", which records the changes in body temperature of 25,000 patients, and the thermometer he used was twice the size of the Albert thermometer. It takes 20 minutes each time to record the body temperature!
Later, in 1867, Albert designed a thermometer that quickly and accurately measures body temperature and is only about 15 cm in length. Unfortunately, Albert's thermometer came too late to help Karl Wendrich.
Around 1980, a talking thermometer was invented. The membranous liquid crystal thermometer is green when the body temperature is normal, the low-burning yellow color, and the high-burning color is red.
In 1988, an electronic respiratory pulse thermometer was introduced for telemetry.