| 摘要 |
The underwater thermometer includes a transparent block, preferably formed of an acrylic plastic, having a planar rear surface provided with a longitudinal recess adapted to receive a fluid and tube type temperature indicator, with an enlargement at one end of the recess for receiving the bulb of the indicator. The indicator is adhesively attached to a foam pad, in turn adhesively secured to a flat, transparent layer, corresponding in shape to the planar rear surface of the block and adhered by a transparent adhesive, preferably an acrylic adhesive, to the rear surface of the block. The transparent layer is also provided, on its rear side, with one or more temperature scales and other indicia printed in reverse and visible through the transparent block, at least a portion of the front of which, such as the portion overlying the recess, is parallel to the planar rear surface. A second layer, preferably formed of a polyester plastic, but opaque, is adhered, as by an acrylic adhesive, to the rear side of the transparent layer. The transparent layer is adhered to the rear of the block by pressure, such as exerted by a roller, which squeezes out all air bubbles from the adhesive, the adhesive layer being thereby reduced to a thickness on the order of 0.001 inch. The opaque layer is similarly secured by adhesive and squeezing to the rear of the transparent layer. Each of the block and transparent and opaque layers may be provided at one end with a hole through which a cord is looped, for attachment of the underwater thermometer to the wrist or other portion of equipment of the user.
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