BAIRD &TATLOCK (LONDON) LTD. 



1077 



Leitz's Universal Projection Apparatus (Epidiascope), designed in accordance with 

 the suggestions of Professor Kaiserling. For prices sec next page. 



This apparatus is available for projection on the screen under a variety of conditions, viz., by transmitted 

 light, for lantern work, by incident light, for episcopic projection, and for direcl microscopic projection. 



Its versatile character renders it an invaluable means of illustrating lectures requiring, for their better under- 

 standing, clear and plentiful ocular demonstrations without loss of time. 



The apparatus has been so designed as to enable the lecturer to pass from one mode of projection to another 

 with as little interruption as possible. 



As will be seen from the illustration, the apparatus consists of an iron framing, the component parts of which 

 are joined by steel tubes. 



A screening curtain, which is not shown in the figure for the sake of clearness, surrounds the entire apparatus 

 so as to prevent the escape of stray light, and thus to ensure darkness in the lecture room. The design of the 

 entire apparatus secures lightness combined with the utmost rigidity. 



The lamp, which regulates itself automatically, is adapted for a continuous current, and is placed behind the 

 optical bench and independent of the latter. A distinctive feature of this lamp is the position of the carbons, which 

 are placed at right angles to each other ; the positive carbon being horizontal and coincident with the optic axis. 



This is an innovation of considerable importance, since thereby the crater of the positive carbon becomes 

 exposed so as to send forth the whole of the available light. With a current of 30 amps., this lamp produces an 

 intensity of 10.500 c.p., whereas with oblique carbons this same lamp yields 7,000 c.p. only. This implies au 

 increase of 50 per cent, in the intensity of the illumination. 



Full descriptive pamphlet on application 



CROSS STREET HATTOTST GARDETST, E-C- 



