The derrick crane introduces a problem for which many solutions have been sought, that of preventing the load from being lifted or lowered when the jib is pivoted up or down to alter the radius.
The treatment of equations of the second and higher degrees introduces imaginary and complex numbers, the theory of which is a special subject.
This Introduces Additional Difficulties Of Construction, But Does Not Otherwise Affect The Method.
The Everard of the Lettres introduces us to a new and for the time a dominant influence on the life and writings.
