CATALOGUE OF PHILOSOPHICAL APPARATUS. 3 



SHELF 4. LIGHT. 



One prism. 



Coloured glasses to exhibit the passage of light through coloured 

 media. 



(Lower Compartment.) 



Photographic apparatus, with specimens of drawings. 

 Heliostate. 



CABINET VII. LIGHT. 



(Upper Compartment.) 

 SHELF i. Jordan's heliograph. 



HerschePs actinometer. 

 SHELF 2. Biot's apparatus for testing liquids by polarized light. 



Window of selenite illustrating the polarizations of light. 



Burning mirror. 

 SHELF 3. Camera for photography, and various apparatus for ditto. 



(Lower Compartment.) 

 Various apparatus connected with polarized light and photography. 



CABINET VIIL HEAT. 



(Upper Compartment.) 



SHELF i. Three large thermometers with coloured liquid. 

 Actinometer, by Cumming and others. 

 Five barometer tubes, immersed in mercury, to show the tension 



of vapours. 



Wollaston's cryophorus, several. 

 One barometer gauge, to screw into steam engine. 

 SHELF 2. Tubes showing the relative expansion by heat of water, alcohol, 



and mercury. 



Apparatus showing expansion of metals by heat. 

 Kutherford's registering thermometer. 

 Danielfs pyrometer. 

 Apparatus to regulate the supply of gas to burners. 



(Lower Compartment.) 

 Parabolic mirrors for radiation. 



Apparatus for freezing without ice, and salts for ditto. 



B2 



