117 



Objectives and Eye-pieces. 



Apochromatic Objectives, (see pp. 6- 9 j 



With each homogeneous immersion objective ive supply free 

 of charge one MACH'S oil drop-bottle and about 13 (/i-ammes of 

 cedar-wood oil. 



Code- word : 



Marks i.. Pabellon 



Subsequent supplies are charged for at the following rates: 



Price : 



Bottle for Immersion Oil with glass cap and rod 



(see Fig. 2", p. 5), each . . 



with metal cap and rod, 



MACH'S pattern (see Fig. 2 *, 

 p. 5), each 



Cedar-wood Oil, 15 grammes (% oz.) in plain bottle 



The two objectives, 12 mm (num. aperture 0.65) and 6 mm 

 (num. aperture 0.95), of the dry series are constructed exclusi- 

 vely for the 10-inch tube (tube-lenf/th 250 mm 10 in.) and 

 are only supplied to special order. 



7.50. 

 '75- 



Pabulo 

 Pacernica 



i*>, (Sptioc&e 



, Sena. 



