. Cassier's magazine . 437 149129 603 606 652533 Mr. Angus Campbell, whose portrait we give inthis issue, is an example of the value of inde-pendent observation and ingenuity in a line ofwork in which the force of routine may be saidto have impeded real development. Nearly everyindustry has its limitations. Until the invention ofthe cotton gin by Eli Whitney the limit of the use-ful cotton crop was the rate at which humanfingers could remove the seeds from the boll. Thelimitation of the seeds being removed, the extentof the useful crop in the Southern United Stateshas reached 10,000,000 to 12,
. Cassier's magazine . 437 149129 603 606 652533 Mr. Angus Campbell, whose portrait we give inthis issue, is an example of the value of inde-pendent observation and ingenuity in a line ofwork in which the force of routine may be saidto have impeded real development. Nearly everyindustry has its limitations. Until the invention ofthe cotton gin by Eli Whitney the limit of the use-ful cotton crop was the rate at which humanfingers could remove the seeds from the boll. Thelimitation of the seeds being removed, the extentof the useful crop in the Southern United Stateshas reached 10,000,000 to 12,000,000 bales a the ground is capable of producing morethan twice this amount, the limit appears in thecapacity of the available labor to pick the Campbell, originally a pattern maker living inChicago, visited Texas, and, seeing the problem onthe spot, was stimulated to devise a machine whichcan pick more than 6,400 pounds, or twelve bales,of cotton a day, being the work of thirty ANGUS CAMPBELL. See Reverse Side. INDEXED Cassiers Magazine AN ENGINEERING MONTHLY Vol. XL MAY, 1911 No. LIQUID-FUEL SUPPLY &J DEVELOPMENTS IN THE OIL FIELDS OF THE WESTERN UNITED STATES By Henry Hale In a recent issue of this magazine there was described the latest progress in the construction ofinternal combustion engines for use with oil fuel. The extending employment of motors, not only forthe heavy oils, but also for use with the lighter hydrocarbon derivatives of petroleum, lends especialinterest to all that relates to the sources of supply. Of these sources, there are two of dominating im-portance—one in the United States and one in Southeastern Russia. The present article relates especiallyto the more recent developments in America, and will give some idea of the opportunities for intelligentconservation which existed in connection with the utilization of this great natural resource.—The Editor. THE fact that Western Pennsyl-vania lay over a submarine
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