দিয়ারা আঞ্চলিক সেটেলমেন্ট অফিস, বরিশাল Ramsden's theodolite represented a terrific move forward while in the instrument's precision. William Gascoigne invented an instrument that applied a telescope having an installed crosshair to be a goal product, in 1640. James Watt designed an optical meter to the measuring of length in https://stanleyd075vdl2.activablog.com/profile