P. Bouguer and others estimate about o 8 for the transmission of light through the entire atmosphere from a star in the zenith.
PIERRE BOUGUER (1698-1758), French mathematician,.
His father, John Bouguer, one of the best hydrographers of his time, was regius, professor of hydrography at Croisic in lower Brittany, and author of a treatise on navigation.
In 1735 Bouguer sailed with C. M.
Ten years were spent in this operation, a full account of which was published by Bouguer in 17 4 9, Figure de la terre determinee.
Bouguer, Camus, Cassini et Pingre (1757).
A commission left Paris in 1735, consisting of Charles Marie de la Condamine, Pierre Bouguer, Louis Godin and Joseph de Jussieu the naturalist.
After taking part in a scientific expedition in the Levant (1731), he became a member with Louis Godin and Pierre Bouguer of the expedition sent to Peru in 1735 to determine the length of a degree of the meridian in the neighbourhood of the equator.
De Paris (1748), Pierre Bouguer describes an instrument which he calls a heliometer.
To Bouguer in 1748 is due the true conception of measurement by double image without the auxiliary aid of a filar micrometer, viz.