Using the Dumpy & Recording Levels

Using the Dumpy & Recording Levels M. S. Martin Aug – 2004 Revised Feb – 2006 & July 2009

Automatic Level / Dumpy Level Circular Bubble Eye Piece Sighting Pointer Horizontal Circle Focusing Knob Objective Lens Base Plate Foot Screw Fine Adjustment

Completed booking sheet example Rise & Fall method

Leveling equipment & booking sheets An automatic level or alternatively a laser level, are the most common instruments used by builders to establish RL’s on a building site. To do this and for future reference, the levels you take on site should be recorded formally, from which you can transfer given RL’s into contour plans, calculate required cut & fill etc.

Notes continued Before we look at the level book, you should be aware and familiar with the following terms View through telescope Cross hairs Upper & lower stadia lines

Line of Site or Line of Collimation The view through the telescope is referred to as “the line of site” or “the line of collimation”

Notes • Terms: • BS – backsite • IS – intermediate site • FS – foresight • RISE – a change in height going up in level • FALL – a change in height going down in level • RL –reduced level • CP – change point • STN – station • BM – bench mark

Notes • In reference to the use of instrument: • The first reading you take is always a B S backsite • The last reading you take is always a F S foresight • Readings in-between are I S intermediate sites

Using the Instrument

Using the Dumpy & Recording Levels