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The saw-tooth voltage wave has two main advantages over the square voltage wave in the testing of electrical networks. These are (1) the saw-tooth wave tests the response of the network not only to odd harmonic voltages but to even harmonics as well and (2) from the response to the saw-tooth voltage wave, the response to any other voltage of the same period may be obtained without the use of Fourier series. The square wave is also shown to be a special case of the saw-tooth wave. The response curves of several circuits to the saw-tooth wave are also obtained, and several experimental results are included.