nal vernier. to each of the three corresponding the true size. The metallic plate, E (Fig. 25, has a lip projecting mund Blunt, Esq., manufacturer of philosophical and vernier pieces. The units of the additional scales are downward from its straight edge, to be placed against astronomical… … the protractor, draughting rule have they found it to distinguish and sliding vernier scale plate— one from the other. Among the the accuracy and skill apparent little organisms which are invisi- in the arrangement and con- ble to the naked eye, there are struction of its mechanism large numbers…
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