Evaluation of the Dedekind eta function

We extend the methods of Van der Poorten and Chapman for explicitly evaluating the Dede-kind eta function at quadratic irrationalities. Via evaluation of Hecke L-series we obtain new evaluations at points in imaginary quadratic number fields with class numbers 3 and 4. Further, we overcome the limitations of the earlier methods and via modular equations provide explicit evaluations where the class number is 5 or 7.