Worked out on a Nautilus pullover machine years ago. The one with the short pull down bar overhead. Idea was to do a set with the pullovers than without rest do a set of pull downs, using a underhand curl grip. You had a lap strap when using. It was a bit of a challenge to squeeze into the machine if being taller and larger than most. Could be a very brutal workout.
The Nautilus machines had a three phased cam gear, to follow the natural strength curve of a muscle contraction. Brilliant idea really. That cam gear looked like a nautilus sea shell, hence the name Nautilus.
I also used a original nautilus leg machine at the same gym. Where the resistance was directed behind the knees and you just straighten out the legs to their full length. It could be a killer experience. Also were strapped down...had to be. The shoulder/delt machine was excellent, including using a over head pressing device after the delts (a form of lateral raises) were exhausted.
The Nautilus gym owner, and his wife, invested heavily in a full and total Nautilus gym. They lost everything when Nautilus becoming less and less popular over time. .
Some more serious physical rehab centers have Nautilus, or Nautilus type machines. Believe Art Jones designed some machines to fit the needs of these medical centers.