Occult does not mean Satanic or evil. It simply means that which is hidden or not known, non-observable, a mystery - something yet to be learned or understood. Sometimes called occultism. There is no supernatural but there are the unseen causative etheric, scalar, Mind and Spiritual forces.
Occult Science that science which is unknown or unacknowledged or yet to be discovered. Learning that which is yet unknown or non-observable. See writings of Helena Blavatsky and Rudolf Steiner both of who knew of Keely's work. Also the old alchemists.
"The world is not prepared yet to understand the philosophy of Occult Sciences. Let them assure themselves first of all that there are beings in an invisible world, whether 'Spirits' of the dead or Elementals; and that there are hidden powers in man, which are capable of making a God of him on earth." [H. P. Blavatsky]
Alchemy - Most Sacred Science
Figure 2.8 - Alchemists Artwork showing duality or Polar States
Figure 2.16 - Alchemical Graphics showing Celestial and Terrestrial Realms
Figure 14.04 - The Alchemical Light
Is Keely the New Mahatma
Tesla and Vedic Philosophy
Urim and Thummin