iarly complete and simple char-acter, which we show in Fig. 3. A f e w words only aTe ne-cessary to enahle any of our readers to appreciate its ohjectand scope. A transit of Venus occurs only twice in ahout120 years; and hence the importance of ohserving this phe-nomenon. The feature to note is the… … previous transits in obtaining reliable observations, owing tothe peculiar optical effects accompanying the phenomenonand the consequent difficulty in insuring the observation ofthe same particular phase in the transit by all observers, aswell as the doubt arising from the exact effect of the…
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