Takao Manufacturing Co., Ltd.
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bHigh Precision Glass vesselbGeneral productsbPhysical and chemical equipmentbSpirit Levelb
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What is a spirit level?
A spirit level is a general name of instrument measuring the level of plane, or is a precision processed product where a single foam is sealed into a glass-made container of circle, rod shape or barrel shape into which alcohol or incombustible special solution is contained. Because the level plane of respective containers is finished to a very much delicate curve, the position of foam changes depending on the angle of plane where the spirit level has been placed. If the plane should be tilted even to a slight degree, the foam gets separated from the center of container, but the foam comes to the center and stops there on the level plane.

Principle of spirit levels
Suppose that we want to measure the levelness in X direction. In that case, we can measure the levelness using the instrument as shown in Fig. 1. And in that case, longer the string, to which a weight is attached, the measurement can be taken more correctly. However, in reality, it is impossible to use instrument that becomes the height of several tens of meters so as to take a correct measurement. Therefore, a spirit level as shown in Fig.2 (the figure shows a rod shape level vial), that utilizes the specific gravity difference between the solution and the foam. The plane on which the scales are engraved forms a correct circle. Larger the radius (the size of radius), it becomes the more delicate curved face, and more correct measurement becomes possible.



Technique of spirit levels
The most needed techniques for making the spirit level high in accuracy (sensitivity) are the super precision glass processing technique. If the curved surface whose diameter is large should be requested, and if the more compact spirit level should be pursued at the same time, the characteristics owned by the glass need to exceed those of resin, etc., and the preciseness and correctness of processing technique are also requested more. Takao Manufacture is proud of the high level of techniques as the pioneer of spirit level, and at present it is tackling even with the manufacture of super high accuracy compact type spirit level ranging to the 100 meters in its diameter.

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