by year there has been an ever-mounting tempo in scientific research. More and more workers have been attracted to this field of endeavor, more and more laboratories have been established, more
recording the data. The cards were described, together with the simple punches and sorting needles, or "tumblers," required for their preparation and manipulation. The types of slotting of the cards, single hole or groups of holes ("fields"), were described and illustrated, together with use of a double row of holes to increase coverage of subject matter.
A technique using linguistic references in the communication of a physics class to characterize class integration is introduced. Measurement of a traditional physics class shows only marginal integration. Measurement of a modified physics class shows that integration can be dramatically improved. A measurement of a best-selling textbook shows very good integration of the section text, but poor integration of discretionary blocks, such as examples, problems, tables and illustrations. Various graphical techniques are presented to visualize the reference data.
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