atic than most of those made at the University of Illinois, but,
even from the table referred to by Mr. Godfrey, pursuing his method of
reasoning, the reverse conclusion might be reached, for if, instead of
selecting, as he has done, the weakest reinforced column in the entire
lot and the strongest plain column, a reverse selection had been made,
the strength of the plain column would have been stated as 1,079 lb. per
sq. in. and that of the reinforced column as 3,335 lb. per sq. in. If
extremes are to be selected at all, the weakest reinforced column should
be compared with the weakest plain column, and the strongest reinforced
column with the strongest plain column; and the results would show that
while an occasional reinforced column may be low in strength, an
occasional plain column will be still lower, so that the reinforcement,
even by this comparison, is of marked advantage in increasing strength.
In such cases, however, comparisons should be made by averages. The
average strength of the reinforced columns, even in this series, as
given in Table 1, is considerably higher than that of the plain columns.

TABLE 1.--AVERAGE RESULTS OF TESTS OF PLAIN _vs._
LONGITUDINALLY REINFORCED COLUMNS.

--------------+--------+--------------+---------------------------------
| | Average |
|Average | strength of |
Location |strength|longitudinally| Reference.
of test. |of plain| reinforced |
|columns.| columns. |
--------------+--------+--------------+---------------------------------
Watertown | 1,781 | 2,992 |Taylor and Thompson's
Arsenal. | | |"Concrete, Plain and Reinforced"
| | |(2nd edition), p. 493.
--------------+--------+--------------+---------------------------------
Massachusetts| 1,750 | 2,370 |_Transactions_,
Institute of | | |Am. Soc. C. E., Vol. L, p. 487.
Technology. | | |
--------------+--------+--------------+---------------------------------
University of| 1,550 | 1,750 |_Bulletin No. 10._
Illinois. | | |University of Illinois, 1907.
--------------+--------+--------------+---------------------------------
City of | 2,020 | 2,300 |_Engineering News_,
Minneapolis.| | |Dec. 3d, 1908, p. 608.
--------------+--------+--------