Voyages of Samuel De Champlain — Volume 03

by Samuel de Champlain

60. Cyprés, Red Cedar or Savin, Juniperus Virginiana. Vide Vol. II. note 168.

61. They were now, perhaps, two miles below Portage du Fort, at the point on the Ottawa nearest to the system of lakes through which they were to pass, and where, as stated in the text, the Ottawa, making an angle, begins to flow directly from the north. The latitude, as here given, is even more than usually incorrect, being too high by more than a degree. The true latitude is about 43° 37'. Vide Walker and Miles's Atlas of Dominion of Canada. Note 62 will explain the cause of this inexactness.

62. Muskrat Lake. On Champlain's map of 1632 will be seen laid down a succession of lakes or ponds, together with the larger one, now known as Muskrat Lake, on the borders of which are figured the dwellings of the savages referred to in the text. The pond which they passed is the last in the series before reaching Muskrat Lake. On the direct route between this pond and the lake, known as the Muskrat Portage road, the course undoubtedly traversed by Champlain, there was found in 1867, in the township of Ross, an astrolabe, an instrument used in taking latitudes, on which is the date, 1603. It is supposed to have been lost by Champlain on his present expedition. The reasons for this supposition have been stated in several brochures recently issued, one by Mr. O. H. Marshall of Buffalo, entitled Discovery of an Astrolabe supposed to have been left by Champlain in 1613, New York, 1879; reprinted from the Magazine of American History for March of that year. Another, Champlain's Astrolabe lost on the 7th of June, 1613, and found in August, 1867, by A. J Russell of Ottawa, Montreal, 1879. And a third entitled The Astrolabe of Samuel Champlain and Geoffrey Chaucer, by Henry Scadding, D.D., of Toronto, 1880. All of these writers agree in the opinion that the instrument was probably lost by Champlain on his expedition up the Ottawa in 1613. For the argument in extenso the reader is referred to the brochures above cited.

[Illustration of an astrolabe.]

Mr. Russell, who examined the astrolabe thus found with great care and had it photographed, describes it as a circular plate having a diameter of five inches and five eighths. "It is of place brass, very dark with age, one eighth of an inch thick above, increasing to six sixteenths of an inch below, to give it steadiness when suspended, which apparently was intended to be increased by hanging a weight on the little projecting ring at the bottom of it, in using it on ship-board. Its suspending ring is attached by a double hinge of the nature of a universal joint. Its circle is divided into single degrees, graduated from its perpendicular of suspension. The double-bladed index, the pivot of which passes through the centre of the astrolabe, has slits and eyelets in the projecting fights that are on it."

We give on the preceding page an engraving of this astrolabe from a photograph, which presents a sufficiently accurate outline of the instrument. The plate was originally made to illustrate Mr. Marshall's article in the Magazine of American History, and we are indebted to the courtesy of the proprietors of the Magazine, Messrs. A. S. Barnes and Company of New York, for its use for our present purpose.

The astrolabe, as an instrument for taking the altitude of the stars or the sun, had long been in use. Thomas Blundevile, who wrote in 1622, says he had seen three kinds, and that the astrolabe of Stofflerus had then been in use a hundred years. It had been improved by Gemma Frisius. Mr. Blagrave had likewise improved upon the last-mentioned, and his instrument was at that time in general use in England. The astrolabe continued to be employed in Great Britain in taking altitudes for more than a century subsequent to this, certainly till Hadley's Quadrant was invented, which was first announced in 1731.

The astrolabes which had the broadest disks were more exact, as they were projected on a larger scale, but as they were easily jostled by the wind or the movement of the ship at sea, they could with difficulty be employed. But Mr. Blundevile informs us that "the Spaniards doe commonly make their astrolabes narrow and weighty, which for the most part are not much above five inches broad, and yet doe weigh at the least foure pound, & to that end the lower part is made a great deale thicker than the upper part towards the ring or handle." Vide M. Blendeale his Exercises, London, 1622, pp. 595, 597. This Spanish instrument, it will be observed, is very similar to that found on the Old Portage road, and the latter may have been of Spanish make.

In order to take the latitude in Champlain's day, at least three distinct steps or processes were necessary, and the following directions might have been given.

I. Let the astrolabe be suspended so that it shall hang plumb. Direct the index or diopter to the sun at noon, so that the same ray of light may shine through both holes in the two tablets or pinules on the diopter, and the diopter will point to the degree of the sun's meridian altitude indicated on the outer rim of the astrolabe.