Geography & History Notes | KCSE, NECTA, ZIMSEC & GCSE

  Prismatic compass surveying is the method of surveying in which the direction of surveying lines and angular measurements are determined with a magnetic compass and the length of surveying lines are measured with a tape or chain. The following are disadvantages/demerits of using prismatic compass surveying can not be conducted in areas known to have magnetic materials demand knowledge especially about rocks to identify the presence of iron ore it is difficult to hold the compass absolutely steady when taking the bearing hence it is impossible to eliminate the errors completely prismatic compass surveying is not useful over long distances RELATED POSTS COMPARISON BETWEEN FISHING IN KENYA AND JAPAN THE CONCEPT OF ENVIRONMENT, COMPONENTS OF ENVIRONMENT AND THE PROBLEM FACING ENVIRONMENT Five (5) Advantages of questionnaire as data collection tool in research 5 DISADVANTAGES OF ROAD TRANSPORT 10 FACTORS THAT AFFECT OCEAN SALINITY CAUSES AND EFFECTS OF OCEAN BREEZE AND SEA BREEZE P...

  In compass survey , the direction of the survey line is measured by the use of a magnetic compass while the lengths are by chaining or taping. Where the area to be surveyed is comparatively large, the compass survey is preferred, whereas if the area is small in extent and a high degree of accuracy is desired, then chain survey is adopted. However, where the compass survey is used, care must be taken to make sure that magnetic disturbances are not present. The compass the two  major primary types of survey compass are: the prismatic compass and surveyors compass Prismatic Compass Invented in 1814, the prismatic compass consists of a small circular box of about 100m. It can either be used as a hand instrument or mounted on a tripod; and is very useful in a situation where rough surveys are needed i.e. where the accuracy of the survey is not the main consideration but the speed. The main parts of a prismatic compass are: compass box, lifting lever, needle, Agate cap, G...

Prismatic compass surveying is the method of surveying in which the direction of surveying lines and angular measurements are determined with a magnetic compass and the length of surveying lines are measured with a tape or chain. The following are principles of prismatic compass surveying Make sure that there is no magnetic materials to avoid incorrect reading the prismatic compass should be held steady to avoid the accumulation of errors avoid wearing wrist watches check the accuracy of instruments like compass, chain and tape before using them RELATED POSTS IMPORTANCE OF SOIL STRUCTURE     7 CHARACTERISTICS OF EQUATORIAL CLIMATE    7 ADVANTAGES OF WETLANDS     7 FACTORS INFLUENCING MASS WASTING    5 CONDITIONS FOR EXISTENCE OF CORAL REEFS    3 TYPES OF WEATHERING AND THEIR PROCESSES    6 LANDFORMS OF HIGHLANDS GLACIATION CAUSES AND EFFECTS OF OCEAN BREEZE AND SEA BREEZE PLATE TECTONICS THEORY EXPLAINED 9 CHARACTERIS...