The "DAVON" Patent 



MICRO-TELESCOPE 



AND 



SUPER-MIGROSGOPE 



A perfect combination of microscope and telescope doing 

 the work of both instruments, and 



BRIDGING THE GAP BETWEEN THEM. 



TERRESTRIAL OBSERVATIONS from six feet to 

 infinity. Magnifications x 16 — 50. Objects which because 

 of their size or shape — e.g., minerals, metal fractures — 

 cannot be put upon the stage of a microscope, can be 

 viewed at from three feet to one foot distance, magnifica- 

 tions 30 — 90 diameters. 



SUPER MICROSCOPE OBSERVATIONS, x 150 



with working distance 2 in. ; x 2000, working distance 

 1 



4 



i m. 



GREAT DEPTH OF FOCUS 



Both visually and photographically. 



TELE PHOTOGRAPHY AND PHOTO MICRO- 

 GRAPHY.— The former has been done up to 70 miles, 

 and the latter up to 7000 diameters with five seconds ex- 

 posure and no long extension camera. 



*' We have tested your micro telescope, and it will do 

 all you claim for it." — Ivor P. John, Principal, Municipal 

 Training College, Hull. 



Illustrated descriptive brochure free from 



F. DAVIDSON & CO., 



Manufacturing Opticians, 

 29 GREAT PORTLAND STREET, 



LONDON, W. 1. 



