110 



SUMMARY OF CURRENT EESEARCHES RELATING TO 



(3) Illuminating and other Apparatus. 



Dunning's New Portable Oil-tight Lamp.*— This (figs. 10 and 11) 

 has been constructed to meet the requirements of microscopists exhibit- 

 ing at societies' meetings and conversazioni. The lamp packs in an 

 oval tin case, 2| in. by If in. by 8 in., and can be easily carried in the 

 coat-pocket without any risk of leakage. When full it will burn for 

 four hours, and give sufficient light for a large binocular Microscope. 



Fig. 10. 



Fig. 11. 



Either the flat or edge of the flame may be used by turning theJmetal 

 chimney, which takes an ordinary 3-in. by 1-in. slip. The flame can 

 be lowered sufficiently for direct illumination. Fig. 10 shows the lamp 

 set up for use. Fig. 11, folded for packing in case. 



Swift's Light Modifiers.f — These are light filters, and consist of a 

 metal frame made to carry one or more squares of tinted glass, with 

 adjustments admitting of any position in front of and close to the 

 source of illumination. The modifiers are made in two forms uone 



* J. Swift & Son's Catalogue, London, 1901, p. 45. 

 t Tom. cit., p. 47. 



