The astrolabe was a mathematical instrument which was used to carry out astronomical measurements, to calculate the positions of the sun and the stars, and to tell the time. This one was made in ...

He worked by royal appointment as a maker of mathematical instruments to Louis XIV and Louis XV, of France. This is a horizontal compass sundial, made of gilded silver. It is of 'Butterfield' type ...

The astrolabe was a mathematical instrument which was used to carry out astronomical measurements, to calculate the positions of the sun and the stars, and to tell the time. This one was made in ...