Coat of arms of Chappell

The blazon

or, an anchor in pale sa. — Crest, an arm, vested .... holding a viper ppr. passing through a cup of an orbicular figure. [Herald s Office, MSS. Vincent, No. 154.]

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.