[Lewis, July 15, 1804]
Sunday July 15th This evening I discovered that my Chronometer had stoped, nor can I assign any cause for this accedent; she had been wound up the preceding noon as usual. This is the third instance in which this instrument has stopt in a similar manner since she nas been in my possession, tho the first only since our departure from the River Dubois. in the two preceding cases when she was again set in motion, and her rate of going determined by a series of equal altitudes of the sun taken for that purpose, it was found to be the same precisely as that mentioned in the preliminary remarks to these observations, or 15 s & 5 tenths too slow in 24 h-as her rate of going after stoping, and begin again set in motion has in two instances proved to be the same, I have concluded, that whatever this impediment may procede from, it is not caused by any material injury which her works have sustained, and that when she is in motion, her error on mean time above stated, may be depended on as accurate. In consequence of the chronometer's having thus accedentally stoped, I determined to come too at the first convenient place and make such observations as were necessary to ascertain her error, establish the Latitude & Longitude, and determine the variation of the nedle, in order to fix a second point of departure.
[Clark, July 16, 1804]
July 16 1804 Monday Set out verry early and proceeded on the Side of a Prarie passd the head of the Island opsd. which we Camped last night, (1) passed a Small willow Island off the L. point, hills make near the river (2) passed a large Island nearest the L. S. below the pt. a Small willow Isd. also one on the Side. this large Island is called fair Sun the wind favourable from the South. Boat run on a Sawyer, (4) pass a place on the L. S. where the hill abt. 20 acres has Sliped into the river lately just above passed under a clift of Sand Stone L. S. a number of Burds Nests in the holes & crevises of this rock which Continus 2 miles, (5) passed a willow Island in a Deep bend to the S. S. river 2 mile wide at this place, note Deed Snags across, passed the Lower point of a Island called Isle Chauvin Situated on the L. Point opposit an extensive Prarie on the S. S., This prarie I call Ball pated Prarie from the range ball hills, at from 3 to 6 miles from the river as far as my Sight will extend, we camped in a point of woods opsd. the Isd. on S. S. in a bend.
[Clark, July 16, 1804]
July 16th Monday 1804 Set out this morning verry early and proceeded on under a gentle breeze from the S passed the upper point of the Island an extensive Prarie on the L. S. passed a large (1) Island Called Fair Sun Isd. a Small willow Isld. at the lower point on the L. S. the boat passd on the L. S. of those Islands Several Small Sand Islands in the Channel, the Boat run on the point of a Snag, (2) passed a place above the Island L. S. where about 20 acres of the hill has latterly Sliped into the river above a clift of Sand Stone for about two miles, the resort of burds of Different Kinds to reare their young. (5) Passed a willow Island in a Deep Bend to the S. S. opposit the river is about two miles wide, and not verry Deep as the Snag may be Seen across, Scattering, passed the Lower point of an Island called by French Chauvin's Situated off the L. Point opposit an extensive Prarie on the S. S. This Prarie I call Ball gated Prarie, from a range of Ball Hills parrelel to the river & at from 3 to 6 miles distant from it, and extends as far up & Down as I Can See, we Camped in a point of woods on the L. S. above the Lower point of the Island. river falling.