perhaps you can find it less expensive and in good shape here: https://www.abebooks.com/servlet/SearchResults?cm_sp=SearchF-_-home-_-Results&ref_=search_f_hp&sts=t&tn=ellipsoidal%20figures%20of%20equilibrium%20
For a moment, I thought it dealt with the model of the ellipsoidal Earth and the calculations derived from there, until I read your comment to the image saying that it was about the hydrodynamics of stars.