178 



KNOWLEDGE & SCIENTIFIC NEWS. 



[AucfST, 1904. 



tion of the observer will enable him to choose an ob- 

 serving post of the smallest possible dimensions, thus 

 decreasing the chance of its being destroyed by the 

 projectiles of the enemy. It may be used as pointing 

 telescope for guns in direct or preferably in indirect 

 pointing. 



The design of the telescope has obviously to be 

 adapted to the special use it is intended for. While 



Modern Cosmogonies. 



By Miss Ag.nes Clerke. 



IX. — The Inevitable Ether- 

 Ether is the fundamental postulate of physics. Its 

 existence, nowise apparent, is in all manner of ways 



Fig. 5. — The Panorama .Military Telescope. 



in a stationary observing post a relatively great field of 

 view, a strong magnification, and high accuracy in 

 reading the position of the optical axis are the most 

 important factors, in the case of an instrument used as 

 pointing telescope in connection with a field gun, 

 dimensions as small as possible, light weight, and solid 

 mounting of the lenses and prisms will be of the ut- 

 most importance. 



implied. The properties that must be assigned to it 

 are, indeed, arduous of conception. We need the aid 

 of forced analogies to enable us to realise, even imper- 

 fectly and indistinctly, the manner in which it dis- 

 charges functions obviously somehow discharged. But 

 in the last resort, everything is obscure; if our thought- 

 borings go deep enough, they always reach the incom- 

 prehensible. 



