Father Himalaya worked hard developing his new ideas and in a short time he was ready to show his new concept, directly at the World Fair in St. Louis.

As before, the explanations that follow result from a careful examination of the photographs below and from the educated guesses they allow. This is due to the fact that the writings of Father Himalaya available today, are even more scant about the Pyreheliophero than about the previous inventions. A particular reference should be made to the drawing, Fig.9(b), of Prof. Joao Gabriel da Silva [1,14].

The final configuration as it was assembled in St. Louis is shown in Figs.8,9. This solution integrates the two distinct motions necessary for the optics to track the sun, at each operating latitude, but with the required simplicity, as explained below.

It was 13 m tall. The total reflector area — a sector of a paraboloid — was 80m2 for a mean focal distance of 10 m. There were 6117 small (123mmx98mm) silvered glass mirrors painstakingly fixed to the underlying structure. The focal area was designed to be no larger than a circle with 150mm diameter. This resulted in a total geometric concentration factor of ~4500 X. Father Himalaya claimed a final concentration factor of 6117 X, hinting at a smaller focal spot, approximately with the same area as each individual mirror. In truth, as already noted, the conic entrance to the furnace (even though it is not an ideal optics [23] for that purpose, as we know today) would have been instrumental in recovering tracking inaccuracies and the resulting radiation spillage that might have occurred and even effectively enhance the final concentration.