Arrangements for Polarisation. 
MnrJcs 
Polarisers : 
I. For use with the illuminating apparatus of the large 
stands. Nicol prism with flange on mounting to tit the carrier 
of the condenser, se that the ordinary diaphragms and also 
selcnite and mica films may be placed over the polarising prism. 
19.— 
Tig. 37. 
Polariser No. 46 I. 
II. Fitting the cylinder diaphragm of the smaller stands. 
Nicol prism with condensing lens 
33.50 
