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CHAPTER VI.

Quantities of Materials.

I. Volumes from Cross Sections.

3. Volumes of Continuous Prismoids.

b. Volumes from Field Notes direct.

In the method just described for measuring the volume of any number of Continuous Prismoids by on operation, the cross-section for convenience in plotting and tracing being superimposed on the others in the manner shown in Fig. 3 of Plate IV.

As was also stated in the description of the method, when the number of prismoids included in one operation became very large there was apt to be some confusion owing to the large number of lines in one diagram, thus bringing in a liability of error due to the possibility of tracing the wrong outline.

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