From Introduction:
A Free Preview of New Magic for the D20 System from the pages of The Ascension of the Magdalene
Mechanomancy is steampunk magic, a new type of magic based on obsessive tinkering with the new scientific principles of clockworks, gears, spring drives, and other such innovations. These new sciences and crafts mesh with the will of the Mechanomancer, producing animated objects of great variety, durability, and sophistication. The most advanced clockworks can be indistinguishable from living creatures until the covering
is broken.
Because of the weird, obsessive focus required to produce Mechanomantic clockworks, Mechanomancers cannot practice other forms of magic. The mindset needed for Mechanomancy precludes any other understanding of magic, as the scientific basis for the art contradicts the mystical teachings of other magical traditions.