Frustrating uncertainties prevailed until workers understood that their results had to be adjusted for the room's temperature and even the barometric pressure.
In 2006-7, Transport Scotland carried out the Forth Replacement Crossing Study to examine options for replacing the existing Forth Road Bridge as doubts about its future viability grew.
Get an overview of the history and timeline of this major new transport project for Scotland.
We're delivering a new bridge - the Queensferry Crossing - and upgrading the connecting road network on both sides of the Firth of Forth.
Transport Scotland is working with the Forth Crossing Bridge Constructors (FCBC) consortium on this project.
The Forth Replacement Crossing (FRC) project is providing up to 1,200 job opportunities and a large number of sub contract and supply order opportunities for Scottish companies.