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In the summer of 1823 M. Laurier determined to put his suggestion into practice. He attached the instrument to the dashboard of a calèche, with five dials indicating respectively tens of leagues, units, tenths, hundredths, and thousandths. He drove from Lachenaie to Quebec city, recording the distance as 54 and 487/1000 leagues. The legislative assembly, after calling Joseph Bouchette, the surveyor-general of the province, and E. D. Wells, a Quebec watchmaker, as expert witnesses, decided to grant the patent. It was not until 1826, by which time five other patents had been registered, that the formalities were completed, the fees paid and the patent obtained. In the same year, 1826, we find him asking the Assembly for assistance in making experiments in measuring distances on water and recording the course of a vessel at sea. No aid was granted, and apparently nothing further came of the project.
In 1805 Charles Laurier married Marie Thérèse Cusson. To his son Charles, or Carolus, who was born in 1815, he gave a forest farm at St. Lin, on the river Achigan, some fifteen miles northeast of Lachenaie. Here the son followed in his father's footsteps, surveying and farming by turns, and here in 1840, when Carolus had been married some six years, Charles and his wife came to spend the rest of their days in a joint household.