Portable or Travellers' Microscopes 39 



illuminator, referred to previously, with this fitting renders 

 an ordinary microscope thoroughly serviceable for metal- 

 lurgical purposes, but it would not, of course, have the 

 vertical adjustment to the stage itself. 



FIG. 13. TRAVELLERS' MICROSCOPE. 

 By J. Swift and Son. 



PORTABLE OR TRAVELLERS' MICROSCOPES. 



A large variety of these are made, every maker having 

 some pattern possessing especial merit. Among these may 



