It established the Board of Longitude and offered a monetary reward (Longitude Prize) for anyone who could find a simple and practical method for the precise determination of a ship's longitude.

These were sent to the Board of Longitude for evaluation and consideration for the Longitude Prize.

Still not satisfied with his own work, Harrison produced H-4, which did get its sea trial and satisfied all the requirements for the Longitude Prize.

The Longitude Prize was a reward offered by the British government for a simple and practical method for the precise determination of a ship's longitude.

In Europe there has been a re-emergence of challenge prizes that following in the tradition of the Longitude Prize for solutions which impact on social problems.

In 2001 the book The Longitude Prize for which he produced the illustrations won an honour at the Robert F. Sibert Informational Book Awards.

He wants to win the Longitude Prize.

Longitude presents the story of Harrison's efforts to develop the marine chronometer and thereby win the Longitude Prize in the 18th century.

In 1730 Harrison created a description and drawings for a proposed marine clock to compete for the Longitude Prize and went to London seeking financial assistance.

They were first developed by Yorkshire carpenter John Harrison, who won the British government's Longitude Prize in 1759.