138 ELEMENTARY PHOTO-MICROGRAPHY. 



PRICES OF MICROSCOPE OBJECTIVES AND 

 ACCESSORIES. 



ain. and lin. objective .. .. .. each 20 /- 



in. and Jin. objective .. .. .. each 25 /- 



Jin. objective .. .. .. .. .. .. 30 /- 



j^in. oil-immersion objective . . . . . . . . 5 o o 



Eyepieces A, B, C each 10 /6 



Projection eyepiece .. .. .. .. .. 40 /- 



Parabolic side silver reflector . . . . . . 23 /- 



Vertical illuminator . . . . . . . . . . 10 /6 



Davis shutter . . . . . . . . . . . . 15 /- 



Bull's-eye 15 /- 



Camera lucida .. .. .. .. .. .. 6/- 



Focussing glass . . . . . . . . . . . . 5 /- 



Adjustable oil lamp, with metal chimney.. .. 25 /- 



Ditto, combined with bull's-eye . . . . ..^440 



Incandescent gas lamp . . . . . . . . 10 /- 



Stage micrometer, i-iooin. and i-ioooin 5/- 



Eyepiece micrometer 5 /- 



Polariscope 25 /- 



Selenite plates each i /6 



Substage condenser, chromatic 35 /- 



Ditto, achromatic . . 75 /- 



Iris diaphragm . . . . . . . . . . . . 25 /- 



Magnesium clockwork lamp . . . . . . . . 20 /- 



Magnesium ribbon per oz. i /6 



Acetylene lamp . . 15 / 



Quarter-plate camera (4jx 3^), without lens . . 20 /- 

 Limelight jet, regulator and gauge, tubing, and 



oxygen cylinder . . . . . . . . . . 9 /- 



Dark-ground illuminator for high powers . . 40 /- 



Macro illuminator for large field with low powers 30 /- 



