1897] 



MICROSCOPICAL JOURNAL. 



129 



fig-ure shows that it has a metal chimney with two openings : 

 this makes it avaihible for the illumination of two micro- 

 scopes at the same time. The burner takes a 5 2 in. wick, 

 which yields sufficient lig-ht for an amplification of 2,000 

 diameters when a suitable condenser is used. 



The g-lasses are optically worked, one being- tinted steel- 

 blue, the other sig-nal-g-reen ; if, however, untinted lig"ht is 

 desired, circles of thin cover g-lass may be used instead. 

 These, if carefully selected, will stand the heat of the 

 flame without cracking-. 



The lamp is so small that it can easily be packed in the 

 same case with the microscope, thus dispensing- with an 



Jd 



extra box. The price of the lamp is about 12s., and it is 

 made by Mr. H. Hinton, 12 Vorley-road, Upper Hollovvay, 

 N. — English Mechanic. 



A Simple Means of Illuminating Objects with Low 

 Powers of Artificial Lighit. — The following- is a simple 

 means of obtaining- a pleasant equably lig-hted field with 

 sufficient intensity and of such a tone as to permit of a 

 prolong-ed examination of low power specimens without 



fatig-ue. 



