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CHAPTER II.

The Polar Planimeter.

Vernier Units, Relative and Actual Vernier Units.

The one one-thousandth of the Revolution of the Integrating Wheel W for any operation is called the Wheel Unit or Wheel Vernier Unit and the number of such units recorded by the recording wheels during any given operation is called the Reading for that operation and will always be designated by the letter r.

In all operations of the Planimeter in the solution of any problem a definite numerical value is assigned to the Vernier Unit. The value thus assigned is called the value of the Relative Vernier Unit or the Relative Vernier Unit and is dependent in any given operation on the conditions of the particular problem of which that operation is a part. These assigned values for various conditions are given in the Tables and their significance and use will be clearly understood later in the discussion.

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