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• W4238000757 abstract "POSSESSORS of what Mr. Webb calls “common telescopes,” will be pleased to have another edition of this most useful adjunct to their instruments, with corrections and additions up to the present time. Now that silvered glass reflectors are so cheap, and apertures little below six inches not uncommon in the hands of amateur astronomers, the author's definition of a common telescope is probably too limited, but these limits are extended as we proceed with the book and find mention of objects barely visible with nine inches. The advice on the use of telescopes, and the mode of observation is sound and good, and too much stress cannot be laid on the necessity of a good solid stand; a good telescope will be absolutely useless with an unsteady mounting. The description of the various phenomena to be viewed in the members of the Solar system may lead possessors of small telescopes to expect too much, the separation of Saturn's rings, the markingson Jupiter's satellites, to wit, although mention is made of the apertures required to view the features mentioned but this may also make the boak useful for work with larger instruments. We must take objection to the great contrast of light and shade, as is often the case in other works, in the cuts of Venus and Jupiter's moons, the dark markings on Venus being infinitely too black, they in reality being only just visible, with first-rate instruments, to a practised astronomer. Drawings of this kind only represent position and shape, but it must be remembered that an amateur expects to see through the telescope exactly what he sees in a drawing. One-third of the book is taken up with a selection of double stars and nebula, as in the former editions, with measures of position and distance up to later dates. Altogether the book will be found most useful to every incipient astronomer, but perhaps there may be too strong a tendency to star-gazing induced by it, and we should have been more gratified to have seen directions to readers having telescopes of certain sizes how to make their observations of real use and not a mere pastime. For instance, double image micrometers can be used on less apertures than 6-in. without clockwork; and some instructions in the use of them, and in reducing their observations so as to show the motions of binaries, would be of great service in teaching amateurs to do useful work; a hint, also, on drawing the ever-changing belts of Jupiter, any extraordinary spots on the sun, the larger nebuke, and last, not least, the star clusters. As soon as amateurs have seen the planets and a few double stars, they should begin to make themselves useful, otherwise they soon get tired of the mere star-gazing and the telescope becomes to them a thing of the past. Celestial Objects for Common Telescopes. By the Rev. T. W. Webb Third edition, revised and enlarged. (London: Longmans, Green, and Co, 1873.)" @default.
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• W4238000757 date "1873-07-01" @default.
• W4238000757 modified "2023-10-18" @default.
• W4238000757 title "Our Book Shelf" @default.
• W4238000757 doi "https://doi.org/10.1038/008199b0" @default.
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