Patent
1976-02-04
1978-02-28
Grieb, William H.
35 19R, 35 34, 73448, G09B 1902, G01N 900
Patent
active
040757706
ABSTRACT:
A metric system teaching and measuring device. The device is in the form of a tubular meter stick having an internal cross sectional area of ten square centimeters producing the volume of one liter for one meter length of the stick. An attachable base provides means for closing the bottom of the stick to form a graduate cylinder. Markings provided through a one meter ruler having centimeter and millimeter markings enable the reading of volume corresponding to centiliters and milliliters respectively. In the graduate form the device may contain a 1 kilogram mass of water with each cubic centimeter or milliliter of water corresponding to 1 gram. By the use of a float the device can be used to determine the mass (or weight) of small objects heavier than the displaced fluid such as water when the object is placed inside the float using known mass of the float as tare. For lighter than water objects the mass can be simply determined by reading the displaced fluid on the graduate markings by taking a reading before and after object is placed in the fluid. The density may then be ascertained by immersing the object in water in the graduate to obtain the volume and dividing the weight by the volume to yield the density. It is understood that specific gravity is the same as density when units of gm/cm.sup.3 or kg/l are omitted.
REFERENCES:
patent: 1399394 (1921-12-01), Mond
patent: 1524928 (1925-02-01), Hardel et al.
patent: 1964145 (1934-06-01), Edelmann
patent: 2647394 (1953-08-01), Schaeperklaus
patent: 3055220 (1962-09-01), Ryan et al.
Stansi Scientific Division, Fisher Scientific Co. Catalog, pp. 73-75.
Welch Scientific Co. Catalog; pp. 39, 40.
Grieb William H.
Robbins Glenn K.
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