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Summary of Contents for AOFAR AF-4074
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Page 2: Components Name
1．COMPONENTS NAME 1. Lid 2. Reading Lens or Prism 3. Window with Aiming line 4. Hinge 5. Scale (Centimeter Ruler on opposite side) 6. Tripod Connection 7. Spirit level 8. Glow-in-the Dark Arrow No1 9. 360° Rotating Bezel Ring 10. Glow-in-the Dark Arrow No2 11. - Page 3 2．PRODUCT SPECIFICATION The compass consist of a Zinc alloy housing and a metal lid(1) with Model AF-4074 a glass window which the Aiming line etched into it. Color Army green Size 100x66X31mm The Window(2) is mounted in the lid(1) with a robust hing that can Dial be turned through 180°.This allows the Window to be moved into...
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Page 4: Map Orientation
By skillfully handing the compass the Arming line(3) corresponds to the Aiming Point(15), thus ensuring that eyes,compass dial and object are at same level and resulting in utmost accuracy.This method allow to read the fraction of an angular degree. Adjust the position of the prism or lens which on the 360° Rotating Bezel Ring (9 ) until you see distinctly the numbers of the compass card(13 ).In models with adjustable eyepiece,the Sighting Lens(16) must be rotated until numbers in degree are clearly visible. - Page 5 Place the compass on the map.Align the centimeter-marked line(5) with that meridian closest to your position,so that the upper lid (1) points to the north of the geographic map. Meridians are parallel lines running from the upper to the lower part of the map . Holding the compass in position ,rotate the map until the north-seeking needle(10) on the dial coincides with the index line of the Glow-in-the Dark Circle(12) .
- Page 6 The longer your route,the more you have to repeat the above operation which will help you keep the direction you defined. 8．LET’S DEFINE OUR POSITION ON THE MAP Select two well visible points on the ground and mark them on the map .Once the map is orientated (operated as Point 6),with your compass measure the value in degree of position (A) and draw a line on the map in accordance with said value.Now pass through point (B).
- Page 7 Table 2 Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Angle Angle Angle Gradient width/distance 0-360 0-4600 0-400 1/60 1/30 1/20 2/30 7/80 1/10 3/10 - 7 -...
- Page 8 7/10 9/10 1+1/5 Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Angle Angle Angle Gradient width/distance 0-360 0-4600 0-400 10．HOW TO ESTIMATE THE DISTANCE TO THE OBJECT BY THE MAP Measure the distance to the object on the map by Centimeter Ruler (5), Multiply the scale of the map. Map Scan:1:25000 Distance(M) =Distance (mm)on the map X 25000÷1000 Map Scan:1:50000...
- Page 9 Distance(M) =Distance (mm)on the map X 50000÷1000 THE HEIGHT OF AN OBJECT 11． You can measure or estimate the distance to the object on the map under Point 10. Multiply this distance by the factor indicated in column IV or V (Table 2) (whichever is easier for you), referring to the angle in column I measured with the clinometer (the description in Point 9) .
- Page 10 Dark Circle(12) during your measuring operation,consider 360°=0°.The calculation will be 360°-second value in degree +first value in degree. Example: If the first value in degree is 4 and the second is 354,the angle will be 10.（360-354+4=10）. 13．HOW TO MEASURE THE DISTANCE ON THE GROUND In accordance to the principle mentioned under point 10 11 ,it is possible to define the distance on the ground...
- Page 11 If the height or width of an object is known or drawn from a map,it’s distance will be defined by simply inverting the calculation mentioned above the description in Point 13. In other words ,if the width of an object with an angle of 8,is 1/7 of the distance according to the table 2 ,the same will be reverse case , the distance is 7 times wider than the width or height.
- Page 12 perpendicular to the line of sight. 15．MEASURE THE DISTANCE WITH SCALE-MARKED GLASS Aiming line Horizontal line with measuring notches Measuring line First object Second object The glass cover with the aiming lines ,is provided with notches which allow you to measure the distance from an object when the distance between the target and another visible object on the same level of the observer on the horizontal line of the glass .
- Page 13 Make sure to be always far from magnetic fields created by iron parts ,magnetic cores or electric wires which cause the compass to show wrong values. Prevent your instrument from falling or getting damaged and never tamper it (so as to keep your guarantee always valid) 17．CONTACT US service@aofar.com URL : www.aofar.com - 13 -...
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