Example image of eyePlorer eyePlorer map for 'Plumb-bob': Ancient Egypt Measuring instrument Stonemasonry Surveying Theodolite Datum (geodesy) Chalk line Latin Lead Dome Spire Tower Inclinometer Shock absorber Center of mass Figure drawing Frame of reference Washer (hardware) Center of balance History of timekeeping devices in Egypt Laser line level Vertical deflection Merkhet Physical geodesy Cabane strut Door knocker Spy basket Builder (US Navy) Flying wires Hayford ellipsoid Chorobates St Andrew's Church, Burnham-on-Sea Atelier Method Spirit level Naked eye René Grillet de Roven Journey to the Center of the Earth (1959 film) Schiehallion experiment Sine quadrant Hajile Vertical direction Earth's gravity Pentaprism History of construction Darts Direction Finding Watch 49th parallel north Tower Hill State Park World Geodetic System Geodesy