BEALE'S DEMONSTRATING MICROSCOPE. 83 



it may be worked with the Objectives of any British maker ; and 

 with due care even high powers may be used, the eye-piece adjust- 



Fig. 40. 



Prof. Beale's Demonstrating Microscope. 



ment (first employed for this purpose by Mr. Highley) giving the 

 power of very exact focussing. Hence this Pocket Microscope 

 may be conveniently applied to the purposes of Clinical observa- 

 tion (the examination of Urinary Deposits, Blood, Sputa, &c), 

 either in hospital or in private practice ; whilst it may also be 

 advantageously used by the Field Naturalist in examining speci- 

 mens of Water for Animalcules, Protophytes, &c. 



57. Prof. Beale's Demonstrating Microscope. — The same instru- 

 ment has been successfully employed by Prof. L. Beale for the 

 purposes of Class-demonstration, its outer tube being attached by 

 a wooden support to a horizontal board, which also carries a small 

 lamp attached to it in the required position (Fig. 40). The object 

 having been fixed in its place, and the coarse adjustment made by 

 sliding the body in the outer tube, these parts may then be im- 

 movably secured, and nothing need be left movable except the 

 eye-tube, by sliding which in or out the fine adjustment may be 

 effected. Thus the whole apparatus may be passed from hand to 

 hand with the greatest facility, and without any probability of 

 disarrangement; and every observer may readily 'focus' for him- 

 self, without any risk of in juring the object.* 



58. Baker's Travelling Microscope. — An instrument has been 

 devised by Mr. Moginie, which is but little inferior in portability 

 to the Pocket Microscope of Prof. Beale, and has many advantages 



* The price of Prof. Beale's Clinical Microscope, as made by Mr. Highley, 

 without Objectives, is only £1 5s. That of the same instrument fitted 

 up as a Demonstrating Microscope, is £:-!. — An excellent Demonstrating 

 Microscope is made also by Messrs. Murray and Heath ; and Mr. Collins 

 has recently devised a new pattern for Hospital use, which may be used 

 either as a Demonstrating or as an ordinary Student's Microscope. 



G 2 



