14 



NOTE. 



Convenient Form of Stand for Use as a Micro-Colorimeter 



and with the Micro- Spectroscope. 



By Marshall I). Ewell, M.D., F.E.M.S. 



The apparatus shown in fig. 2 was constructed for use with 

 Lovibond's standard coloured glass slides, or with the micro- 

 spectroscope. It will be seen that the apparatus consists of two 

 objectives carried by tubes screwed into a prism-box. The 12 mm. 



Fk;. 2. 



Spencer objectives are matched, and in order to absolutely secure 

 equality of working distance, one of them (the right-hand one) is 

 fitted with an adapter with the Society's thread, male at the upper 

 end, and female at the lower. When the matching has been 

 satisfactorily attained a lock-nut clamps the objective, and the two 

 par-focal objectives can then be simultaneously focused by the 

 ordinary slow motion. The Lovibond tinted glasses are inserted 



