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Updated: May 14, 2025
This Afternoon, by the mean of Several Azimuths and the Amplitude, found the Variation to be 0 degrees 34 minutes East, from which it appears that about the aforegoing Noon we have Crossed the Line of no Variation in the Latitude of 10 degrees 38 minutes South, and, according to the following Observations, in 32 degrees 0 minutes West longitude from Greenwich.
Took several Observations of the sun and moon, the result of which gave 90 degrees 13 minutes West Longitude from Greenwich. The Variation of the Compass by the Mean of several Azimuths 17 degrees East. The Longitude by account is less than that by Observation, 37 minutes, which is about 20 Miles in these high Latitudes, and nearly equal to the Error of the Log line before mentioned.
We continued our course, steering W. till the evening of the 8th, when the variation of the compass, by several azimuths, was 12' W., and by the amplitude 5' W. At noon, on the 9th, our latitude, by observation, was 9° 46' S., longitude 232° 7' W. For the last two days we had steered due W., yet, by observation, we made sixteen miles southing, six miles from noon on the 6th to noon on the 7th, and ten miles from noon on the 7th to noon on the 8th, by which it appeared that there was a current setting to the southward.
Wind East-North-East to East; course North 3/4 West; distance 90 miles; latitude 26 degrees 1 minute North, longitude, per Observation Sun and Moon, 43 degrees 18 minutes West. Friday, 7th. Moderate breezes, and Cloudy. A.M., Variation per mean of 20 Azimuths 5 degrees 20 minutes West.
At noon on the 6th, we were nearly in the same situation as at noon on the day before: In the afternoon we found the variation, by several azimuths and the amplitude, to be 15° 10' E. On the 7th at noon, we were in latitude 47° 6' S. and had made twelve miles easting during the last twenty-four hours.
By observation Fort Mueller is in latitude 26 degrees 11 minutes 30 seconds South, and longitude by lunar observation 128 degrees East, the variation being about 1 degree 25 minutes East by azimuths. 18th. Rested at spring. Marked a tree sixty yards south of camp F 74, being 74th camp from Geraldton.
Our Course and distance sail'd this 24 Hours is South 86 degrees 30 minutes West, 102 Miles; Latitude in 9 degrees 36 minutes South, Longitude 231 degrees 17 minutes West. Sunday, 9th. Light Airs and Clear weather the most part of this 24 Hours. In the evening found the Variation by several Azimuths to be 0 degrees 12 minutes West, and by the Amplitude 0 degrees 5 minutes West.
"While making the survey from the head of tide water I took the azimuths and altitudes of several of the highest peaks around the head of the inlet, in order to locate them, and obtain an idea of the general height of the peaks in the coast range. As it does not appear to have been done before, I have taken the opportunity of naming all the peaks, the positions of which I fixed in the above way.
Wind, East-North-East and East-South-East; course, North 47 degrees 15 minutes West; distance, 50 miles; latitude 29 degrees 43 minutes South, longitude 126 degrees 53 minutes West. Thursday, 16th. Light Airs next to a Calm and clear Weather. Variation by the mean result of 21 Azimuths, 1 degree 30 minutes East.
"Marsh Lake is a little over nineteen miles long, and averages about two miles in width. I tried to determine the width of it as I went along with my survey, by taking azimuths of points on the eastern shore from different stations of the survey; but in only one case did I succeed, as there were no prominent marks on that shore which could be identified from more than one place.
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