Solid Brass WWII Military Pocket Compass Prismatic compassMaterial: Polished Brass Dimensions: 2.5" diameter Box dimensions: 3.5” W x 4” L X 1.5” H Prismatic compass is a navigation and surveying instrument which is extensively used to find out the bearing of the traversing and included angles between them, way-points (an endpoint of the lcourse) and direction.[1] Compass surveying is a type of surveying in which the directions of surveying lines are determined with a magnetic compass, and the length of the surveying lines are measured with a tape or chain or laser range finder.[2] The compass is generally used to run a traverse line. The compass calculates bearings of lines with respect to magnetic needle. The included angles can then be calculated using suitable formulas in case of clockwise and anti-clockwise traverse respectively. For each survey line in the traverse, surveyors take two bearings that is fore bearing and back bearing which should exactly differ by 180° if local attraction is negligible. The name Prismatic compass is given to it because it essentially consists of a prism which is used for taking observations more accurately.[3] Least count means the minimum value that an instrument can read which is 30 minutes in case of prismatic compass. It means compass can read only those observations which are multiples of 30 minutes, 5° 30', 16° 00', 35° 30', for example.[4] BearingsThe compass calculates the bearings in whole circle bearing system which determines the angle which the survey line makes with the magnetic north in the clockwise direction. The whole circle bearing system also known as the azimuthal system varies from 0 degrees to 360 degrees in the clockwise direction.[5] The included angles can be calculated by the formulas F-P ±180 in case of anti-clockwise traverse and P-F ±180 in case of clockwise traverse, where 'F' is the fore bearing of forward line in the direction of survey work and 'P' is the fore bearing of previous line.[4] SHIPPING Delivery time is 6 to 8 days in working days, remote areas will take up to 15 days for shipment.product will dispatched in 48 hours once full payment is received.please make sure to provide a full and correct address and contact number. NOTE:- All custom duty will be paid by the buyers. PAYMENT PayPal is accepted RETURN IS ACCEPTED 30 days money back or item exchange, buyer will pay return shipping. FEEDBACK Please leave a positive feedback, buyer's feedback is important for us, to grow our business on eBay.In any case of any discrepancy in our product, please contact to us, before leaving negative or neutral feedback. This is a Reproduction Item, Not Sold As Antique.Best for gift item The holiday season is the busiest shopping period of the year, don?t worry!!! Our catalog covers every festival including Thanks giving, Black Friday, Cyber Monday, Christmas. Please do visit to our store and get yourself a treat. INSTRUCTIONS Dear buyer what can cause your item to break due to carelessness by courier partner Or if it reaches late due to any reason, it can be a disease or a career problem. Dear buyer, don't worry if you face any such problem then we are with you. If there is any issue, we will replace it and not give it a refund. ....Thank You For Your Trust.... |