To provide a hydrometer capable of detecting a variation of specific weight always stably, high precisely, and surely even the liquid to be measured on specific weight is moving and the liquid level is varied.
This hydrometer is provided with an improved float 3 which is formed with a nonmagnetic material and in which a pair of magnets 4 are separately built in as a magnetic field imparting means. The float 3 is constituted that most of which is sunk in the liquid to be measured on specific weight i.e., in the normal state battery liquid wherein a center of gravity line M2 which is existing on a plane perpendicular to a stem 1 extending vertical direction, is positioned lower than the center line M1 existing on a plane specified by half value (h/2) of height value, further the clearance d is set regarding to the height size of the float 3 in a range of 1/8-1/4. Thereby the float 3 moves smoothly along the stem 1 even the battery is used on a slope.
YAMAGUCHI MASAHIRO
NEC TOKIN CERAMICS CORP
JAPAN STORAGE BATTERY CO LTD
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