LAND SURVEYING PROFESSIONALS BD FOR DUMMIES

বাংলাদেশ জরিপ অধিদপ্তর মেনু নির্বাচন করুনRamsden's theodolite represented an awesome step forward in the instrument's precision. William Gascoigne invented an instrument that utilized a telescope by having an set up crosshair like a goal system, in 1640. James Watt formulated a