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CHAPTER X.

Various Forms of Planimeters and their Characteristics.

Improved Polar Planimeter.

A still higher form of the Polar Planimeter is that having an adjustable tracer arm which is graduated for its entire length into some scale of equal parts, usually and preferably the value of one division of the graduation being ½ millimeters and which is sub-divided by the Carriage Vernier to read 1/20 millimeters.

In this form of instrument the needle forming the Pole at the end of the Polar Arm is discarded in favor of the Ball Pole and weight which adds much to the facility and accuracy with which results are obtained in all its forms of operation.

As this is the form of Planimeter used throughout our entire discussion and described in detail in Chapter II it needs no further reference here except to repeat and emphasize the statement already made, that of the many varying forms of Planimeters it is that one which is best adapted to the General uses of the Engineer, and is that instrument of all others, capable of rendering him invaluable aid in any and every form of this professional work.


No. 5.

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