Notebook with notes and calculations on Magneto Generators dated 1881, multiple coils, self excitation, rectification and commutation, shunt dynamos and the transmission of power. The notes start from the other end of the volume with notes on convection problems, potential of point charge dated 1898, potential of magnet regarded magnetronically, zonal harmonics dated 1901 and vector bundles in abstract dynamics. Some pages are used twice, from one direction on one side and from the other direction on the other side.