First Class Microscope Stands— Nos. 1 & 2. 



APPARATUS. £ s . d _ 



3rd Eye-piece for No. 1 Stand 17 '> 



do. do. No. 2 do 15 



Indicator to No. 1 Eye-piece 5 



do. No. 2 do 5 



do. No. 3 do 5 



Achromatic Condenser on an improved construction of two 

 powers, and revolving; diaphragm, to give various 

 illuminating pencils, from 80° to 25°, also stops for 



the central rays, complete with adjustments 5 



Achromatic Condenser without diaphragm, apertures 60° and 



20°, brass work with adjustments 2 10 



Achromatic Condenser, brasswork of, with adjustments 10 



Right Angle Prism for reflecting the light more perfectly 

 than the mirror, with adjustments and fittings to the 

 triangular mirror stem complete, and the reflecting 



surface uncovered for the convenience of wiping 2 10 



Amici's Prism for oblique light, mounted on an improved 



plan, and the reflecting surface uncovered 2 2 



Nachet's Prism for oblique light, with accurate revolving fitting 110 

 Wenham' 'sParabolic Reflector, giving a dark-field with an Ob- 



ject-Glassof 100° of aperture, adjusting stop and fittings 1 15 

 Polarizing Apparatus of two Nicol's Prisms, with revolving 



fittings 2 5 



Darker's Series of Selenites, which give 13 different colours 

 and their complementary tints, mounted on an im- 

 proved plan for their more accurate and easy appliance 3 15 



Selenite Film of two colours 5 



Black Glass Polarizer, with fitting 15 



Two Double Image Prisms and Selenite film, with fittings to 



Eye-piece, and brass plate with holes 2 2 



Crystals to show rings round the optic axis and fitted to 



Eye-piece each from 10 6 



Tourmalines from 1 



Large Bull's Eye Condensing Lens on stand 110 



Smaller Condensing Lens, with ball-and-socket joint to limb 18 



Side Silver Reflector, with complete fittings to limb 1 1 



Dark Wells of three sizes, with holder 12 (J 



Brooke's double Nose-piece 1 10 



Camera Lucida, Wollaston's 10 



Micrometer, with Jackson's adjusting screw and fittings to 



Eye-piece 10 



ilficrome£erforstage,dividedintol00thsandl000thsofaninch 10 



Compressorium 1 



do. Wenham's, for use with Parabola 7 6 



Screw Live Box 14 6 



Large Live Box 8 6 



Smaller do 6 6 



Large Glass Trough, with wedge and spring complete 8 6 



Frog Plate, with bag, &c, complete 10 6 



Glass Tubes, set of three 2 6 



Three-pronged Forceps 8 6 



