  The finite sums of powers of cosecs occur in numerous situations, both
physical and mathematical, examples being the Casimir effect, Renyi entropy,
Verlinde's formula and Dedekind sums. I here present some further discussion
which consists mainly of a reprise of early work by H.M.Jeffery in 1862-64
which has fallen by the wayside and whose results are being reproduced up to
the present day. The motivation is partly historical justice and partly that,
because of the continuing appearance of the sums, his particular methods
deserve re--exposure. For example, simple trigonometric generating functions
are found and these have a field theoretic, Green function significance and I
make a few comments in the topic of R\'enyi entropies.
