BAIRD &TATLOCK (LONDON) LTD. 



Q. Compensating eyepieces, 6 and 12 



R. Projection eyepieces, 2 and 4, at 2 . . 



S. Huyghenian eyepiece, 4 



T Tube slide 



U. 4 objective slides 



V. Case for objective slides and objectives 



W. Large photo-micrographic camera 



X. Focussing lens X 6 



Y. Focussing gear and rod 



7. Reversing prism 



Brought forward 62 ,X 6 



2 10 



4 o 

 06 



8 



1 12 



15 

 IS 10 



1 6 



at 8s. each 



2 II 

 I O 



- 92 6 6 



If instead of achromatic objectives, apochiomatic objectives are required, we recommend 

 MM. Apochromatic objective, 16 mm. .. .. 400 



NN. ,, ,. 8mm. .. .. .. 500 



<><>. ,, ,, 4mm. .. 700 



PP. 2 mm. X. A. 1.30 .. .. :. 15 o o 



31 



< 



v \ i / ,-* n 

 - u 



Path of rays in paraboloidal condenser 

 1143-1146 1143 



1143' Paraboloid Condenser for dark ground illumination for observing living bacteria .. 200 



1144' Cardioid Condenser for examination of colloids .. .. .. .. ..200 



1145' Inverted Gas Lamp with metal chimney .. .. .. .. .. ..160 



1146' Glass Flask on stand .. .. .. .. .. .. .. ..070 



1147 1 Micro-Nernst Lamp, with condensing lens, for alternating or continuing current. (State 



voltage and resistance.) . . . . . . . . . . 200 



1148' Projection Nernst Lamp with aplanatic condenser, micrometer movement for condenser 



and filament on saddlestand . . . . . . . . . . ..550 



1149' Light Filter Trough for above and holder .. .. .. .. 10 



Prices /or resistance, either no or 220 volt, on application. 



1150' Mercury Lamp," Hageh's Micro-lamp," for monochromatic light. Complete, including 

 resistance, for no volt. 



1151 T Mercury Lamp, " Hageh's Micro-lamp," for monochromatic light. Complete, including 



resistance, for 220 volt. . . . . . . . . - . . 4 19 



