...However, pressure measurement using a liquid column becomes impractical when it exceeds 0.4 MPa (about 4 m of mercury column). Therefore, around 1830, Jacob Perkins (1766-1849) and others devised a pressure measurement method using a free piston, which became the prototype of the deadweight type pressure gauge. In 1893, Amaga invented the double free piston type Amaga pressure gauge, which measured high pressures up to 300 MPa. ... *Some of the terminology that mentions "Perkins, J." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…しかし液柱による圧力測定は0.4MPa(水銀柱で約4m)を超えると実用的でなくなる。そこで1830年ごろ,パーキンズJacob Perkins(1766‐1849)らによって自由ピストンを利用した圧力測定法が考案され,重錘型圧力計の原型となった。93年,アマガは複自由ピストン型のアマガ圧力計をくふうし,300MPaに至る高圧力の測定を行った。… ※「Perkins,J.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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