In the book "The Morning of the Magicians" the Belgian writer Louis Pauwels says that nothing prevented the bathyscaphe (that was designed by Auguste Piccard after World War Two) to be made in the nineteenth century. The bathyscaphe Trieste reached the bottom of the Challenger Deep (11,000 meters deep) in 1960.
I need help to verify that Louis Pauwels' claim is true.
A) Was "state of the art" advanced enough in 1890 to build a bathyscaphe capable of reaching 11,000 meters if we consider that this vessel needs to have the following essential systems? :
Spherical gondola, made of cast steel or forged steel, which is able to withstand a pressure of 1.25 metric tons per cm² and needs to have a diameter of two meters.
Float chamber, which need not be made of a particularly resistant steel, and that needs to be filled several with tens of cubic meters of gasoline for buoyancy.
A set of electric batteries capable of driving electric motors with propellers and also able to empower a group of electromagnets that hold the ballast iron pellets in place.
Life support system able to allow two people to breathe for a day inside the cabin.
Window made of transparent glass or plastic that can withstand the pressure.
A set of electric (or gas) lights capable of operating underwater and withstanding the pressure.
Just another question:
B) Is there any other essential bathyscaphe part that I didn't notice?