Seientific American. [JUNE 12, 1880. 370 same time. BY CHARLES B. BOYLE. the field, disappears when we close the right value considered by our government au- … adjusted so as to see a single star, and that jective or object glass. In such telescopes an BINOCULAR COMET SEEKER. when directed to a single star such an object would be visible whose light would be instrument would be sure to see two images too feeble to be seen in the field of an ordinary eye…
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