
IN 1913 WILLIAM BROOKS CABOT AND Russell W. Porter together explored the St. Augustine River in Labrador, east of the route up which a railroad is now being pushed toward the great new iron-ore deposits. In later years they discussed the question whether an explorer could determine his latitude in the field without a precision instrument. Porter tried it and described the experiment in the journal Popular Astronomy.
Cabot, he wrote, "deplored even the addition of a pocket sextant and horizon to a camper's pack where dead weights must be shaved to a minimum, and argued that the tools irreducible to the explorer-a knife, hatchet and fish line- together with nature's available materials, would suffice to obtain latitude within a mile" by measuring the sun's altitude. Porter doubted this, but made the experiment at Springfield, Vt., and was greatly surprised to find that the specified precision could be leached if he used a steel tape instead of a stretching fish-line.
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