Other notes were made on loose sheets of paper or on leaves of the note books. Many of these were destroyed, others were rubbed out to make room for recording what was regarded as more important data, and a few were retained quite by accident.
QUESTIONS THAT ENTER CALCULATIONS FOR
POSITION OF THE NORTH POLE.
By Frederick A. Cook.
Much abstruse, semi-scientific and academic material has been forced into the polar discussions about proofs by observation. The problem presented is full of interesting points, and to elucidate these I will ask the reader to go back with me to that elusive imaginary spot, the North Pole. Here we find no pole—and absolutely nothing to mark the spot for hundreds of miles. We are in the center of a great moving sea of ice and for 500 miles in every direction it is the same hopeless desert of floating, shifting crystal. I believed then that we had reached the Pole, and it never occurred to me that there would be a cry for absolute proof. Such a demand had never been presented before. The usual data of the personal narrative of the explorers had always been received with good faith. But let us reopen the question and examine the whole problem.
Is there any positive proof for a problem of this kind? Is there any one sure shoulder upon which we can hang the mantle of polar conquest? We are deprived of the usual landmarks of terrestrially fixed points. The effort to furnish proof is like trying to fix a point in Mid-Atlantic. But here you have the tremendous advantage of known compass variation, sure time, reasonably accurate corrections. Not only by careful observation at sea of fixed stars and other astronomical data, but by an easy and quick access to and from each shore, and by reliable tables for reductions gathered during scores of years of experience.
All this is denied in the mid-polar basins at the time when it is possible to arrive there. There is no night, there are no stars, and the sun, the only fixed object by which a position can be calculated, is not absolutely fixable. It is low on the horizon. Its rays are bent in getting to the recording instruments while passing through the thick maze of floating ice mist. This mist always rests on the pack even in clear days. The very low temperature of the atmosphere and the distorting, twisting mirage effect of different strata of air, with radically different temperatures, wherein each stratum has a different density, carry different quantities of frosted humidity.
All of this gives to the sunbeam, upon which the calculation for latitude and longitude is based, the deceptive appearance of a paddle thrust into clear water. The paddle in such case seems bent. The sunbeam is bent in a like manner, since it passes through an unknown depth of refractory air for the correction of which no law can be devised until modern aerial navigation brings to a science that very complex problem of the geography of the atmosphere. For this reason, and for others which we will presently show, this whole idea of proof by figures as devised by Mr. Peary and the armchair geographers, falls to pieces.
Let us take the noon observation—a fairly certain method to determine latitude in most zones of the earth where for hundreds of years we have learned to make certain corrections, which by use have been incorporated as laws in the art of navigation. About five minutes before local noon the sea captain goes to the bridge with sextant in hand. His time is certain, but even if it were not, the sun rises and sets and therefore changes its altitude quickly. The captain screws the sun down to a fixed angle on his sextant; he puts the instrument aside; then takes it up again, brings the sun to the horizon, examines his instrument. The sun has risen a little further; it is not yet noon. This is repeated again and again, and at last the sun begins to descend. It is now local noon. This gives a rough check for his time. There is a certain sure moment for his observation at just the second when it is accurate,—when the sun's highest ascent has been reached. Such advantages are impossible when nearing the Pole. The chronometers have been shooting the shoots of the pack for weeks. The sudden changes of temperature also disturb the mechanism, and therefore time, that very important factor upon which all astronomical data rest, is at best only a rough guess. For this reason alone, if for no other, such as unknown refraction and other optical illusions, the determination of longitude when nearing the Pole becomes difficult and unreliable. All concede this, but latitude, we are told by the armchair observer, is easy and sure. Let us see.