[Groff] macro question

[Gaius Mulley]

Hi,

I wonder whether anyone has a macro which will typeset the first
word of a chapter so that the first letter of the first word is
double the vertical spacing of the remainder of the word.
(There has to be a name for this, can anyone enlighten me?)

For example:

 --- his has been on my mind for some time
  |  and I wonder whether someone has done
 the hard work already?
  
just curious

Gaius