An aboriginal description of a hydrometer appears in a letter from Synesius of Cyrene to the Greek academic Hypatia of Alexandria. In Synesius' fifteenth letter, he requests Hypatia to accomplish a hydrometer for him. Hypatia is accustomed acclaim for inventing the hydrometer (or hydroscope) ancient in the backward 4th aeon or aboriginal 5th century.1
The apparatus in catechism is a annular tube, which has the appearance of a canal and is about the aforementioned size. It has notches in a arrect line, by agency of which we are able to analysis the weight of the waters. A cone forms a lid at one of the extremities, carefully adapted to the tube. The cone and the tube accept one abject only. This is alleged the baryllium. Whenever you abode the tube in water, it charcoal erect. You can afresh calculation the notches at your ease, and in this way ascertain the weight of the water.2
According to the Encyclopedia of the History of Arabic Science, it was acclimated by Abū Rayhān al-Bīrūnī in the 11th aeon and declared by Al-Khazini in the 12th century.3
It after appeared afresh in the plan of Jacques Alexandre César Charles in the 18th century.
The apparatus in catechism is a annular tube, which has the appearance of a canal and is about the aforementioned size. It has notches in a arrect line, by agency of which we are able to analysis the weight of the waters. A cone forms a lid at one of the extremities, carefully adapted to the tube. The cone and the tube accept one abject only. This is alleged the baryllium. Whenever you abode the tube in water, it charcoal erect. You can afresh calculation the notches at your ease, and in this way ascertain the weight of the water.2
According to the Encyclopedia of the History of Arabic Science, it was acclimated by Abū Rayhān al-Bīrūnī in the 11th aeon and declared by Al-Khazini in the 12th century.3
It after appeared afresh in the plan of Jacques Alexandre César Charles in the 18th century.
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