The chronograph is used to register time.

Chronograph

The chronograph is used to register time.

The image shows surveying done with a spirit level.

Spirit Level

The image shows surveying done with a spirit level.

The longitudinal section of the precise level of 1900, used for surveying.

Precise Level

The longitudinal section of the precise level of 1900, used for surveying.

The image shows surveying done using a sketching screen, which is valued by beginning surveyors.

Sketching Screen

The image shows surveying done using a sketching screen, which is valued by beginning surveyors.

The image shows surveying done using a slope board.

Slope Board

The image shows surveying done using a slope board.

The zenith telescope used in surveying.

Zenith Telescope

The zenith telescope used in surveying.