| 摘要 |
The sliding rule (1,2,3) is provided with at least one moving part (6,22) and at least one fixed part (5,21), one of which is fitted with at least a first scale (19, 32, 34, 35, 39) related to an operating parameter on a refrigerating appliance, the said parameter being used as input data for calculating purposes, and at least a second scale (20, 33, 36, 37, 41) related to a working parameter on the refrigerating appliance, the said parameter depending on the said operating parameter used as input data. The other part is designed so as to conceal the second scale and is fitted with a marker (16, 27, 28, 29, 40) and windows (10,26) for displaying values on the second scale (20, 33, 36, 37, 41) when the marker is set to a given value on the first scale (19, 32, 34, 35, 39).
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