Equatorial dial showing the plumb bob for levelling the instrument and the quadrant for setting the latitude , circa 1760 , by L T Muller of Augsburg. The British Museum , London

- Image ID: WHBADR
Equatorial dial showing the plumb bob for levelling the instrument and the quadrant for setting the latitude , circa 1760 , by L T Muller of Augsburg. The British Museum , London
TopFoto / Alamy Stock Photo
Image ID: WHBADR
Equatorial dial showing the plumb bob for levelling the instrument and the quadrant for setting the latitude , circa 1760 , by L T Muller of Augsburg. The British Museum , London