T. is divided into five triangles, and each angle contains four principles, and thus there are eight questions for each angle, or two questions for each of the four principles; this gives twenty-four questions for each triangle of T, and twenty-four times five gives a total of one hundred and twenty questions for figure T.

Now let us deal in sequence with the questions of T., following the sequence of the principles. And as God is the first and most noble principle of T., the questions regarding God come first.

To solve each pair of questions, we refer to the propositions of the cameras and match them together, by forming the first three cameras in the three outer circles, and the two following cameras in the two inner circles that revolve in the middle, and by forming the solutions to the questions in accordance with all the cameras of the common figure. This rule applies to this Art in general, and never fails.