ent
into the perusal of books on mathematics, astronomy, and associated
subjects. He progressed rapidly, driven by his overpowering interest and
aided by his quick intellect.

Little by little, Borghesi managed to acquire the basic texts that
explained this new world to him, probably borrowing them from old
seminary friends. As each new book came into his hands, he devoured it
in his desire to master its contents. He discussed each new principle or
precept that he learned with Bertolla. Together, they attempted to apply
his new learning to the calculations necessary for a timepiece which
would demonstrate the astronomical theories in visual form. Borghesi
taught himself slowly, step by step, and the result was a profound
understanding of astronomical science. He conceived the project of
constructing a great astronomical clock which he felt could be
accomplished by combining Bertolla's mechanical skills with his own
recent mastery of astronomy and mathematics.

First Borghesi Clock

It is not difficult to visualize the two men, the priest and the
clockmaker, as they sat together night after night working out their
plans. Father Borghesi would painstakingly outline the astronomical
principles he wished to have the clock exhibit and the mathematical
principles which would be involved to operate them. Bertolla
concentrated on them and tried to transcribe the principles into
functional mechanical terms, visualizing each operation in terms of
wheels and gears. Little by little the two men coordinated the numerous
elements and welded them into an operating entity. They adjourned either
to the stark simplicity of the rectory or, probably more often, to
Bertolla's little home workshop, the priest standing over his friend
while the latter worked at his bench in the dark paneled interior
illuminated only by the several lamps on the work benches.

This first clock which the two men combined to create is a monument to
the great scientific knowledge of the self-taught priest and the
technical ability of the clockmaker--a unity combining astronomical
science, mechanics, and artistry. The story of the project is told in a
little book, _Novissima Ac Perpetua Astronomica..._, which Borghesi
later published. Explaining the incentive which inspired him, and the
premises from which he began his work, he wrote:

From the foundation of astronomical science long ago,
innumerable [and] repeated observations of both ancie