743 



E 1+26 



2 l + SÓ» - ' ^ ^ 



Y =-K t =--l±^ 



We shall now discuss some special cases. 



1. Compression resp, extension. 



In this only P~=^0 is put, from which follows 



P- 



(in this the liquid pressure p is neglected). 

 Then the lowering of the freezing point is 



AT = fz.dz^ 



T r 



Making use of (52) and carrying out the integration, we get : 



T Z.' 



which formula is in perfect concordance with Riecke's. ^) 



We apply this to ice, which we shall treat as an isotropous 

 substance. 



Rip^CKE assumes 0,7 kg. for the drawing-solidity of ice per mm^ and 

 calculates with this 0°.017 for LT. As for most substances the 

 pressing-solidity is considerably greater than the dj-awing-solidity, this 

 diminution can probably be made larger in the case of compression, 

 so that it can be measured comparatively easily and with suitable 

 apparatus even the just mentioned lowering of the freezing point 

 w^ould also be liable to be measured. 



2. Sagging. 



In this case we only assume that Py =|= 0. When we consider a 

 point for which x = R, y = 0, then it follows from the formulae that : 



P,/ 1 + 20 

 Z. = X, = Q Y. = — ^ -— — . 



~ .tP^ 1 + 3^ 



The lowering of the freezing point of the considered point is : 



T r 



^T= \YJy,. 



1) E. RiECKE, loc. cit. p. 736 form. (20). 



