A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . circles, should have the preference for advanced students, even though theinstrument be without a driving-clock. But, in order to possess any real advantageover the simpler mounting represented in Models B or C, it must be accurately adjustedfor latitude; it is heavier, more complicated, and not so easily managed. For the beginner,therefore, I do not hesitate to recommend the general form shown in Models B and are purely illustrative. Both types of mou
A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . circles, should have the preference for advanced students, even though theinstrument be without a driving-clock. But, in order to possess any real advantageover the simpler mounting represented in Models B or C, it must be accurately adjustedfor latitude; it is heavier, more complicated, and not so easily managed. For the beginner,therefore, I do not hesitate to recommend the general form shown in Models B and are purely illustrative. Both types of mounting are made by many differentmanufacturers in a number of designs; all representing the same principle of alt-azimuth type is less expensive as well as less complicated than the equatorial,and it is adapted, if well made, to all the ordinary needs of the amateur. * See Chambers Handbook of A stronomy, vol. i., the Oxford Press, 4th Edition, New York and London; GibsonsAmateur Observers Handbook, Longmans, Green & Co., New York and London, p. 36 fol.; Todds New Astronomy,New York, American Book Co., p. TELESCOPE—MODEL C Ait-Azitnuth Mounting io8 a Beoinncr0 Star^Booh The Telescope for the School In teaching the circles of the celestial sphere and in illustrating the theory of the science,the instructor may desire an equatorial mounting, but in the practical work of observa-tion, in introducing others—by simple object-lessons—to the pleasure and practice ofviewing the things of the sky, the less elaborate mounting will meet the requirementseven of the teacher. For high-schools and colleges I would strongly advise, where finan-cially possible, a telescopic equipment of three or four small instruments, rather than onevery large one more elaborately mounted. Of this group of telescopes, the largest may havean aperture of 3^4 or 4 inches and be mounted equatorially (if desired); the others may beof 3 inches in aperture (or even smaller) and on alt-azimu
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Keywords: ., bookcentury1900, bookdecade19, booksubjectastronomy, bookyear1912
