20) awarded him, upon a full discovery of the principles of his time-keeper, the payment of such a sum, as with the 2500L.

he had already received, would make one half of the reward; and the remaining half was to be paid when other chronometers had been made after his design, and their capabilities fully proved.

He was also required to assign his four chronometers--one of which was styled a watch--to the use of the public.
Harrison at once proceeded to give full explanations of the principles of his chronometer to Dr.Maskelyne, and six other gentlemen, who had been appointed to receive them.

He took his timekeeper to pieces in their presence, and deposited in their hands correct drawings of the same, with the parts, so that other skilful makers might construct similar chronometers on the same principles.

Indeed, there was no difficulty in making them; after his explanations and drawings had been published.