Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 40
llimation ofthe telescope must be atright angles to the axis of the pivots. Now, althoughthe instrument-maker can effect this to a high degreeof approximation, yet the excessive delicacy of astro-nomical observation is such that minute errors, whichentirely elude detection by ordinary… … 22 Astronomy. measuring how far each one is incorrect, and thencorrecting every observation for the irregularity. Forthe present, however, it will be sufficient to point outthe means whereby the instrumental errors (as theyare called) can be detected. § 19. Error of Collimation.—Let a b (fig. 9) be…
Astronomy
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