| 摘要 |
1345639 Conversions between unit systems D U ROBINSON 28 Jan 1972 [28 Jan 19711 4027/72 Heading G4B A device for making conversions between different systems of units comprises a base 14, bearing a circular logarithmic scale, and a disc 15, pivotal with respect to the base and bearing at least three indicators 16, the angular spacing of the indicators being such that they intersect values on the scale 14 corresponding to one and the same quantity expressed in different systems of units. Instead of the units of currency shown, the indicators may correspond to units of weight, area, length, volume, speed or pressure, Fig. 2 (not shown). |
