The natural course of events after a primary triangulation is to construct a secondary triangulation with sides of a few miles, and then a tertiary triangulation at a parish level to show all significant details.
2.
The succeeding year ( 1847-' 48 ) he extended the secondary triangulation of Mississippi sound westward to Lake Borgne, and made observations for latitude and longitude at Dollar point, Galveston bay, including chronometer difference with Pascagoula station.
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