Google for a description of Launch Complex 19

or read "On The Shoulders of Titans: A History of Project Gemini". You
can find it for free to read on-line at
http://www.hq.nasa.gov/office/pao/Hi...4203/cover.htm. Its a
great book. I can't find the section that addresses your question, but
if you have a liitle time, you will probably enjoy the search.

blue skies

JP