Prices. 



Reflecting Condenser A with Centreing Device .... 16 — 

 Sleeve for the above — .40 



(This is necessary in the case of those stands only which 

 are fitted with a swing-out condenser, and accordingly have 

 no sleeve. After swinging the condenser out and opening the 

 upper iris diaphragm to its full extent the sleeve is slipped 

 in from below in the place of the condenser and the dark- 

 ground illuminator introduced into the sleeve.) 



/Reflecting Condenser B 16.— 



>/felectncal Arc Lamp, with hand feed for a current of 

 4 amps, and illuminating lens mounted on stand for 

 connection to any existing house supply .... 16. — 



^Resistance for 110 Volts 6.— 



Nernst Lamp on Stand #"— SO- 



Incandescent Gas Lamp on Stand 6. — 



Illuminating Lens on Stand, (Bull's Eye Condenser) . . 8. — 



to be used with Nernst Lamp or incandescent gas light 



Apochromatic Objective 4 mm with correction collar. . 48. — 



Achromatic Objective No. 8 with correction collar . . 20. — 



Eyepiece 2. — 



Compensating Eyepiece No. 12 10.— 



Compensating Eyepiece No. 18 8. — 



/Funnel, screwing into the 712" or l /iz' a oil immersion 



lenses — .40 



