Abstract

The search for the Northwest Passage in the years following the Napoleonic Wars provided both a market and testing ground for marine chronometers. Long voyages and extreme temperatures challenged the best chronometers. Among the firms seeking to meet those challenges was that of William Parkinson & William James Frodsham. Their chronometers performed particularly well in the Arctic, as John and James Clark Ross, William Edward Parry, and Edward Sabine gladly recognized. The way in which chronometers were made and sold, however, meant that there were sometimes controversies over who was entitled to claim credit for a particular instrument. A letter from Parkinson & Frodsham in 1821 illustrates the problem, and its causes in the nature of the trade; the text of that letter is published here in its entirety. Also problematic, and discussed here, was the craft aspect of the industry, in which the ‘mechanical construction’ of a chronometer might not reveal the process of manufacture that gave it its steady rate and accuracy