Knowledge Volume 4; v. 30; With which is incorporated Hardwicke's Science gossip, and the Illustrated scientific news. A monthly record of science

 
9781236243584: Knowledge Volume 4; v. 30; With which is incorporated Hardwicke's Science gossip, and the Illustrated scientific news. A monthly record of science
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...is an invention of a later age. I (Mr. Lynn) have examined the collection of bulls... only four issued by Calixtus III., relating to the mendicant and other religious orders, and find no mention whatever of a comet. When the story was first invented it is difficult to say." A very definite statement with regard to the issue of a papal bull and an order for the ringing of bells at mid-day is, nevertheless, to be found in Lardner's Astronomy, Vol. II., p. 542. Young, in his General Astronomy, states the excommunication as a matter of popular belief, but says, further, " It is doubtful, however, whether such a formal bull was ever really promulgated." F. W. HENKEL. Answers to Correspondents. John H. Bowers (Hartford, Conn.).--To cement celluloid to celluloid use a solution of celluloid in amyl acetate. I know of no very satisfactory cement to make a surface of celluloid adhere to glass, if that is what is required, but a layer of the celluloid solution adheres very well, and ol course can be built up to practically any required thickness by repeated applications. It is a little dangerous to use celluloid in electric machines because of its great inflammability, but the layer formed by coating glass (which should first be coated with shellac) is perfectly safe and is practically non-inflammable. Ebonite may also be coated in the same way. Commander Squire.--The Solar System is moving towards the star X in the constellation of Hercules. Herschel first noted that the stars Arcturus and Vega (on either side of Hercules) were receding from one another, while Sirius and Aldebaran were approaching one another, proving that the Solar System was moving towards Hercules. Ball gives the rate of progress as 10,000 miles every half-hour, and says it would ta...

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