It was later proved by John Harper and Stephen Theriault.

The church was built in 1838-42, and designed by John Harper of York.

John Harper, a Republican state Representative, won 35 percent.

John Harper then gave a talk on the various lead minerals, showing several examples, some of which he had collected in Cumbria.

John Harper was born in Winthrop, Mass., on July 17, 1924.

A team led by John Harper conducted a 13-year project to reconstruct a working bombe.

His son, also John Harper, also became a commander in the Royal Navy.

John Harper (born 11 November 1937) is a retired computer engineer.

On 6 September 2006, John Harper and the rebuild team first demonstrated the working Bombe in action.

John Harper patented a mechanism for straining wire, used both to make fences and later also for the cables of bridges.