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The variation of the orbital planetary elements is the subject of general perturbations. We suppress the Hamiltonian approach. The readers of the book should be the graduate students of Applied Mathematics and Dynamical Astronomy as well as interested readers in this subject. We offer complete symbolic computations for a second-order J - S theory. We assume the J - S couple to be as point masses. We used the Macsyma programs to determine the expansion of, up to degree 6 in eccentricity - inclination, since the PC cannot pass this upper limit for a third-order J - S theory.

Electrochemical machining of internal conical shape (ECMICS) is one of non-conventional machining processes. The main application of ECMICS is for making small, accurate and high surface finish internal tapers for many applications such as the orifice of the fuel injectors and the hard metal which cannot be machined by any other machining process. A laboratory for ECMICS was started in Minia Univ. comprising principally of electrochemical machining unit with the necessary instruments. Sodium Chloride solution of 200 gm/liter concentration was selected as a working electrolyte Specimens were...