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      the equipment you have available;
                         the type of terrain on which you are measuring.
                        Each of the various methods is fully explained and illustrated in
                  the table.
                             1             2
                    Section   Method              Accuracy             Remarks              Equipment
                                                               Quick and rough
                                 Clinometer                    estimate for rather
                                                                                           Home-made
                   4.1*,4.2*  models 1 &  Low                  steep slopes.
                                                                                           clinometer.
                                 2                             Hand-held
                                                               instrument.
                                                               To be fixed in
                                 Clinometer  Low            to ground.                     Home-made
                      4.3*
                                 model 3         medium        Direct reading in           clinometer.
                                                               percent.
                                                               To be fixed in
                                 Clinometer,  Low           to ground. Small, easy         Home-made
                      4.4*
                                 model 4         medium        to make direct              clinometer.
                                                               reading in percent.
                                                               Quick and rough
                                                 Low
                                                               estimate.                   Lyra
                     4.5**       Clisimeter      (about  10
                                                               Direct reading in           clisimeter.
                                                 percent)
                                                               percent.
                                                               Quick, rather good
                                 Optical         Medium        estimate.                   Optical
                     4.6**
                                 clinometer  to high           Direct reading in           Clinometer.
                                                               degrees and percent.
                                                               Requires distance
                                 Miscella-                     measurement.
                                 neous           Medium        Best estimates for
                     4.7***                                                                Various.
                                 levelling       to high       small gradients,
                                 devices                       especially with best
                                                               levels.
                        1
                          *Simple **more difficult ***most difficult.
                        Task 2. Put up 5 different types of questions to the text.
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