Purpose a: compass, for measuring the 24 basic geographical directions with improved accuracy, being arranged to both enable non-expert and expert in the theory based on topographic branch will be readily understood that the principle of compass by scientific measurement and identical no professional knowledge is advantageously used. Construction: compass, for measuring 24 basic geographical directions, comprising: a front surface, by 16 layers, curve graph by radially dividing a circle is generated from the center of circle to the outermost line separated and 24 directions arrange the definition generated by the angular segments that the curve graph for dividing a circle enters 15 degree; The rear surface defined is arranged by 19 layers and 24 directions.
展开▼
