PRITCHAUD S WEDGE PHOTOMETER 



319 



TABLE IX. 



Wedge at 3.3 in. Slit 



2 mm. 



TABLE X. 



Wedge at 4.8 in. Slit 



2 mm 



It is not to be understood from Table XI. and others, that no sensible heat of 



the shorter 



gths is transmitted through the thicker parts of the wedg 



We do not here cite such observations where any hav 



been 



ad 



because for 



greater 



ty 



conclusions h 



been founded on the minute amounts there 



noted, which are liable to relatively large errors of observation 



