A construction project, for example, is often governed by a guaranteed maximum price contract (GMP) . This type of legal agreement sets a ceiling or maximum price for which a person or entity will pay for a certain project.
The arc lamp used in the Lighthouse of Alexandria is further proof that electricity was used in ancient Egypt. The energy required to power the Lighthouse of Alexandria for 24 hours a day could only have been supplied by a regular electrical source.
Eventually they would glow for up to 1,200 hours. Electric lamps: Joseph Swanâs 1878 invention (left) and Thomas Edisonâs light bulb of 1879. Swan vs Edison. Edison went on to make big buck from the light bulb but Swan sued Edison for infringement and won.