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2ed- A common Octant of 14 Inches radius, graduated to 20', which by means of the nonius was devisbile to 1', half of this sum, or 30" was perceptible by means of a micrometer. this instrument was prepared for both the fore and back observation; her error in the fore observation is 2°+, & and in the back observtion 2° r 1' 40.3" + at the time of our departure from the River Dubois untill the present moment, the sun's altitude at noon has been too great to be reached with my sextant, for this purpose I have therefore employed the Octant by the back observation. the degrees & ", recorded for the sun's altitude by the back observation express only the angle given by the graduated limb of the instrument at the time of observation, and are the complyment of the double Altitude of the sun's observed limb; if therefore the angle recorded be taken from 180° the remainder will be the double altitude of the observed object, or that which would be given by the fore observation with a reflecting surface.
Shore opposite to the center of good Island where I observed the meridian altitude of O's L. L. with Octant by the back observation, wich gave me the Latitude- 40° 20' 12" N. I now set the Chronometer as near noon as this observation would enable me, and proceeded untill evening, when we came too on the Stard. shore opposite the lower point of the Island of the Bald prarie where we encamped.
Wide & the other is 70 yds wd. and heads Close to the R. Dumoin The Aieways Nation have a Village on the head of these River they run through an even Countrey and is navagable for Perogues Cap Lewis took Medn. altd. of sun U. L with Octant, back obsvn. made it 37° 12' 00" delayd 11/2 hours. Capt.
He had a considerable knowledge of astronomy, and was acquainted with the most useful branches of the mathematics. Captain Cook made him a present of an Hadley's octant; and, though it was probably the first he had ever seen, he understood, in a very short time, the various uses to which that instrument can be applied.
Before leaving, Ismailoff gave Cook letters for the Governor of Kamtschatka and the Commandant of Petropaulowsk; and Cook, finding "he was tolerably well versed in astronomy," gave him a Hadley's octant, and though it was the first one he had seen, he soon made himself acquainted with its uses.
They informed us that the Countrey on both Sides of muddy river's to the hill called by the french 3 ms. below this place, a Small Praries below the hill, 4 Deer Killed to day I assend a hill &. after measuring the river &c. &c. &c. Error of Octant 2° 00' 00" +. made Several other observations- I made an angle for the Wedth of the two rivers.
If they had been as well acquainted with geography as some assert, if even any astronomer had travelled as far south as the equator, we should certainly have had pictured in the old star charts some constellations in that region of the heavens wherein modern astronomers have placed the Octant, the Bird of Paradise, the Sword-fish, the Flying-fish, Toucan, the Net, and other uncelestial objects.
Side and incamped on the Lb Side rain all night the tents together along the N; 76 W 25 Poles S 26 W, to the point above- S 19° to the pot below the River Cap Lewis observed meridean altitude of sun U L-back observation with the octant & artificeal horozen- gave for altitude on the Limb 38° 44' 00" sun octant Error 2 0 0 +
Lewis took meridean altd. of Suns U. L. with the octant above Split Rock C. &made the altitude 37° 6' 00 error of octt. as useal 2° 0' 0" + The Countrey for Several miles below is good, on the top of the high land back is also tolerable land Some buffalow Sign to day I am Still verry unwell with a Sore throat & head ake N. 61° W. to the mouth of a Creek Called big monitu on St.
By several trials made today in order to adjust my Octant and ascertain her error in the direct observation, I found that it was 2° 1' 45" + or additive beyond the fracture; this error was ascertained by a comparison with my sextant the error of which had been previously ascertained. the error of Octant in the direct observation on the broken limb next to 0 or below 55° 20 inclusive is 2° additive only. Sent Shannon Labuish and Frazier this morning on a hunting excurtion up the Kil-haw'-a-nak-kle river which discharges itself into the head of the bay. no tidings yet of Sergt.
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