1897] 



MICROSCOPICAL JOURNAL. 



129 



fig-ure shows that it has a metal chimney with two opening's : 

 this makes it available for the illumination of two micro- 

 scopes at the same time. The burner takes a jA'm. wick, 

 which yields sufi&cient lig'ht for an amplification of 2,000 

 diameters when a suitable condenser is used. 



The glasses are optically worked, one being- tinted steel- 

 blue, the other sig-nal-g-reen ; if, however, untinted light is 

 desired, circles of thin cover glass 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 



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

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



N. — English Mechanic. 



A Simple Means of Illuminating Objects with Low 

 Powers of Artificial Light. — The following is a simple 

 means of obtaining a pleasant equably lig-hted field with 

 sufl&cient intensity and of such a tone as to permit of a 

 prolonged examination of low power specimens without 

 fatigue. 



