The accuracy of all measurements made with the Planimeter depends upon the condition of the Planimeter, upon the accuracy and care with which the measurement is made and upon the strict compliance with those details of operating which theory and experience have shown to be described or referred to in previous pages and others will be given as their application becomes evident in the following descriptions. The insistence on the strict observation of these conditions will be seen to be justified when their importance is more fully understood and the effect of this observance on the accuracy of the practical working of the Planimeter is shown.

After having examined the condition of the Planimeter and made any adjustments found necessary after testing the instrument in the manner just described, the method of measurement of the given area is as follows:

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