As readers of my AFDB book are aware, use of foil-based deflector beanie technology among unaffiliated paranoids dates back only to the 1920s due to the NWO's previously tight control over the availability of aluminum. However, the forces of mind control have been incorporating aluminum psychotronic deflection into their field equipment since the Atlantean era. Here's an example from the 19th century:
This was taken from "On Improvements in Helmets and Other Head-Dress for British Troops in the Tropics, More Especially in India" by Julius Jeffreys, F.R.S., published in 1862 in the Journal of the Royal United Services Institute for Defence Studies. In the article, Jeffreys explains how he incorporated an aluminum lining into helmet designs:
Desirous of trying the repellent virtues of the new metal -- aluminium, and having heard that Mr. Marshall, a manufacturer of leaf metal of much ingenuity and spirit, had produced specimens of aluminium beaten into leaf, I applied to him, and found him much interested in my proposal that it should be introduced as a coating for the surfaces of hats. At no little trouble -- the manufacture being new -- he prepared for me some books of aluminium leaf. The present is, I believe, the first employment of this metal in the form of leaf, and it promises to be of much utility. I find it to possess great reflecting power, though the experiments have not been continued long enough to decide its virtues as compared with gold leaf. It has apparently little liability to become tarnished. The interior of this pattern helmet is lined with leaf aluminium. I find it to form an excellent article also in the form of aluminium paper. Both aluminium and tin, in the form of leaf or bronze, could, I am satisfied from trial, be united to a smooth calico or linen surface, by means of a flexible cement, prepared from gutta-percha, india-rubber, or other hydro-carbons. I find on trial both india-rubber and gutta-percha promise to answer the purpose, and to have the great advantage of giving much flexibility to a metallic cloth.
For his hollow-shelled design (fig. 2), the aluminum lining would go on the inner shell, or crown (E -- not the beanie-like structure, h, which is only for cranial support):
Reverting again to the body of the hat, if it have two crowns ... the inner crown ought, under all circumstances, to have both its surfaces coated with metal; not only the inner one, facing the head, but the outer surface also, which faces the interior of the outer shell...
As you'll note, this bi-directional shielding agrees with my own stated best practices for AFDB construction, where the foil's shiny side is facing both outward and inward. The outer shell of Jeffreys' design provides protection for the aluminum leaf and utilitarian camouflage (according to Jefferys, utility is "the true standard of taste in every manly business").
The holes in the "coronet ventilator" (B, b) and the inner shell opening (e) are so troops can receive orders from their commanders via encoded psychotronic signals that interact with a specially cut ruby diffracting-crystal (not pictured for security reasons) centrally mounted under the coronet. Ruby, a crystal primarily composed of aluminum, is an important component in psychotronic generators and other mind-control equipment. The British Empire's interest in India was primarily to control her ruby mines, thus gaining an upper hand in the Global Psychotronic War.
Since this was published where orthonoids could read it, not only was any mention of classified diffracting-crystal technology omitted, but the aluminum shielding itself was couched in terms of its thermal protection so as not to expose the British Empire's wide-spread use of mind control in the subjugation of local populations. But the following illustration of Jefferys' other much-less-camouflaged design clearly shows the true psychotronic-deflective nature of helmet aluminization:
Here we have what Jeffreys describes as "a hat, or shako, which, for the wearer's sake, rejoices in a metallic exterior." This aluminum-clad design features only vertical and horizontal surfaces so that "it may not throw any rays into the eyes of persons standing either near or far off." While he again couches it in terms of solar rays, in reality the purpose was to protect troops from accidentally shooting their comrades in the head with their psychotoons and having the rays bounce back into their own faces, causing themselves befuddlement or possible mind-erasure. Such brazenly uncamouflaged helmets would have been worn by British Imperial mindshock troops during frantic exchanges with Mahratta freebooters, whose own alum-soaked turbans, while relatively primitive, would still have required more aggressive psychotronic fire to overcome.