Consequently , very few in the industry ever witnessed Douglass using his invention .
Douglass would then go to work at creating the audience , out of sight from the producer or anyone else present at the studio in order to preserve secrecy around his technique .
Very few in the industry ever witnessed Douglass using Douglass ' invention .
Douglass would then go to work at creating the audience , out of sight from the producer or anyone else present at the studio in order to preserve secrecy around his technique .