SCIENCE-ADVERTISEMENTS 



FOR COLLEGES, HIGH SCHOOLS 

 PREPARATORY SCHOOLS 



AND PRIVATE OBSERVERS 



THE McKREADY MULTIPLE TELESCOPE 



( The Multiple Telescope is Protected by Letters Patent) 



1[ The individual telescopes of the instru- 

 ment are so adjusted to oue another that 

 their fields of view are coincident. 



fi As the fields of view are the same, an 

 instructor stationed at the central or pilot 

 telescope may free the beginner from 

 initial difficulties, and may increase 

 the pleasure and save the time of all 

 concerned. 



^ The observer may take two students 

 at once, one on either hand ; and as he 

 "finds" the object in the central tele- 

 scope, it is found for them ; as he 

 " follows " the object and keeps it in the 

 field, it is kept in field for them. 



^ Thus the students at the side telescopes 

 have only to look ; what the instructor 

 sees, they see, —at the same instant, 

 under the same conditions, and in the 

 light of his immediate comment. Inter- 

 esting detail can be pointed out, impor- 

 tant principles can be illustrated in 

 direct relation to objective examples ; all 

 phenomena can be understood more 

 quickly and more clearly. Instruction 

 is made coincident with observation. 



^ In the taking of students by twos in- 

 stead of singly, there is a time-saving for 

 the students who wait, as well as for the 

 instructor who works. And the in- 

 creased readiness and pleasure of com- 

 prehension add to the efficiency and 

 cultural power of observation. Should 

 the teacher desire the student at right or 

 left to practice the control of the instru- 

 ment, its direction may be yielded to 

 either, — the three tubes being rigidly re- 

 lated to the common center. 



^ The tubes, however, are adjustable 

 vertically and horizontally ; they are in- 

 stantly removable — to increase the ease 

 with which the instrument may be 

 carried about ; and the connective mount- 

 ing is also detachable from the tubes and 

 tripod. When the mounting is adjusted 

 for astronomical use at time of delivery 

 by this Company, no readjustment is 

 necessary in passing from moon to planet, 

 or from planet to star. 



^ There is a sense of actuality in the 

 direct observation of the things of the 

 larger universe which cannot be given 

 by a picture or by a lantern-slide. 

 Ought not every High School, as well as 

 every College, to have its Telescope? 

 Prices from $185. 



^ Kelvin McKready, designer and in- 

 ventor of the Multiple Telescope, has pro- 

 duced in his " Beginner's Star-Book," a 

 simple, practical telescopic manual — 



with star maps, observer's catalog, etc. 



^ It has been pronounced "the best" book in its field 

 by such men as Sir David Gill, Puiseux, President of the 

 Astronomical Society of France, Todd of Amherst, 

 Russell of Princeton, Mitchell of Columbia, Brashear of 

 Pittsburgh, Stone of the University of Virginia, and en- 

 dorsed with equal warmth by Frost of Yerkes, Campbell 

 of Lick, Max Wolf of Heidelberg, Beebe of Yale, and 

 many others. Says W, Jevons, Department of Astro- 

 physics of the Royal College of Science, Souih Kensing- 

 ton, London, " I shall take every possible opportunity to 

 recommend the work to both teachers and students. It 

 is the right thing with any course of evening 

 demonstrations." Circulars and endorsements of "A 

 Beginner's Star-Book" on request. 



^ Let tis send you the Book (price $2.50 

 net; by mail, $2.75), with full descrip- 

 tions of the Instrument We sell other 

 telescopes also, large and small ; our 

 catalog tells of them. 



THE TELESCOPE SUPPLY CO. 

 152 Temple Street New Haven, Conn 



