By This Last Method,
The Errors Which May Be Either In The Instruments Or Lunar Tables, Destroy
One Another, And Likewise Those Which May Arise From The Observer Himself;
For Some Men May Observe Closer Than Others.
If we consider the number of
observations that may be obtained in the course of a month (if the
Weather
is favourable,) we shall perhaps find this method of finding the longitude
of places as accurate as most others; at least it is the most easy, and
attended with the least expence to the observer. Every ship that goes to
foreign parts is, or maybe, supplied with a sufficient number of quadrants
at a small expence; I mean good ones, proper for making these observations.
For the difference of the price between a good and a bad one, I apprehend,
can never be an object with an officer. The most expensive article, and
what is in some measure necessary in order to arrive at the utmost
accuracy, is a good watch; but for common use, and where that strict
accuracy is not required, this may be dispensed with. I have observed
before, in this journal, that this method of finding the longitude is not
so difficult but that any man, with proper application, and a little
practice, may soon learn to make these observations as well as the
astronomers themselves. I have seldom known any material difference between
the observations made by Mr Wales, and those made by the officers at the
same time.
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