MR. SWIFTS MICROSCOPE LAMP. 



93 



soldered to the sliding ring ; all the author has seen from 

 different makers have come to pieces in a very short time. 

 Browning's oil lamp, with bull's-eye condenser and silvered 

 reflector, is shown at Fig. 82. It has a porcelain shade 

 covering the chimney to protect the eyes from the excessive 

 glare. This lamp (and in- 

 deed most oil lamps) is used 

 with paraffin oil, and the 

 brilliancy of the light may 

 be increased by dissolving 

 a little camphor in it. The 

 light is more intense when the 

 edge of the flame is turned 

 towards the object to be 

 illuminated ; but if quantity 

 of light is required rather 

 than intensity, the flat side 

 of the flame may be so 

 disposed. 



A rather better lamp than 

 the above for general work is 

 that of Mr. Swift, and shown 

 in Fig. 83, which, however, 

 in the writer's estimation, 

 would be much improved by 

 a glazed porcelain chimney 

 with two opposite perfora- 

 tions, for in most examina- 

 tions (perhaps all) it is a very important point to avoid a 

 flood of extraneous light passing to the eyes. 



There are several other lamps which may be mentioned 

 here : Collins's Bockett lamp and Fiddian's lamp, made by 

 Messrs. Ross and Co. The Fiddian lamp is supported by a 

 massive claw stand, from which rises a vertical support on a 



FIG. 83. 



