| 摘要 |
<p>A specific gravity tester for liquids such as antifreeze solution for automotive vehicles, comprising a transparent tube with a flexible hose on one end and a collapsible suction bulb on the other end, a plurality of flat and wafer-like floats of various specific gravities and disposed in the tube, the tube having an interior guideway confining the floats and extending longitudinally of the tube, the guideway having a width substantially greater than thickness to orient all of the wafer-like floats approximately the same therein, the tube defining a pair of substantially broad, flat side surfaces confronting each other and extending across the width of the guideway and also defining a pair of longitudinal edge surfaces across the thickness of the guideway, and the tube also having a pair of elongate ribs in the guideway and extending longitudinally thereof, each of the ribs projecting from a respective side surface in a direction across the thickness of the guideway and each rib being spaced from each edge surface by a distance significantly less than the width of the wafer-like floats, the ribs being spaced from each other by a distance which is significantly more than the thickness of the wafer-like floats and which is also significantly less than twice the thickness of the floats.</p> |
