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 BS IS FS RISE FALL RL REMARK 2250 47.195 BM 2825 575 46.620 A 2120 1976 849 47.469 B 1880 2400 280 47.189 C 486 1394 48.583 D 6250 4862 2243 855 1388

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