Marine Diver

The Marine Diver was a brass instrument designed by William Scoresby and Joseph Banks to measure the ocean’s residual heat below the surface. Lowered as far as 7,000 feet, it extended observation into waters inaccessible to a human body; in the book’s account, it also becomes one half of a striking contrast between industrial-era measurement and evidence carried unknowingly by a whale.

Development and Use

After studying science and meeting Joseph Banks in London, William Scoresby took command of the Resolution and later the Esk. He wanted to test the proposition that seawater was warmer below the surface. Scoresby sent his findings to Banks, and the two developed the Marine Diver as a more accurate means of measuring that subsurface heat. The device made the ocean’s unseen conditions available to inquiry through an instrument that could be lowered far beneath the reach of ordinary observation.

Scoresby’s Arctic voyages joined commercial whaling to scientific investigation. Whaling helped finance his research, while his work aboard the Esk brought him close to the ice and the physical hazards of the northern sea. He recorded calculations, sketches, suppositions, and descriptions even during a perilous journey through pack ice. The instrument belonged to this larger practice of turning a working voyage into an opportunity to observe and document the ocean.

The Instrument and the Stone Lance

The book places a drawing of the Marine Diver beside a drawing of a stone lance found in a whale, deliberately setting a device of the Industrial Revolution against a Neolithic tool. The contrast is more than one of materials or eras. The brass instrument was made to carry a human measurement down into the sea; the lance had travelled inside a living whale, preserving evidence of a much older human encounter with the animal.

Scoresby reported that the master of the Whitby whaler Volunteer showed him part of a lance removed from a whale killed near Spitsbergen in 1813. It had been embedded in the blubber, and the wound had healed, leaving a small white scar. Scoresby noted that weapons of this kind had been used by people on the shores of the frozen ocean. If a weapon from one side of the continent could be found in a whale caught in the Atlantic, it suggested a passage between the Atlantic and Pacific. The lance thus made the whale itself an unwitting bearer of geographical evidence—evidence the Marine Diver, for all its reach, was not designed to reveal.

Knowledge, Depth, and Time

Scoresby’s account of the lance later attracted Herman Melville, who borrowed the two volumes of An Account of the Arctic Regions with a History and Description of the Northern Whale-Fishery from the New York Society Library in 1850. In Moby Dick, the finding becomes a question about how long the whale had lived: if the lance had been embedded for a century, the animal was older still. The book distinguishes this literary inference from what later evidence could establish, but the episode shows how one observation could prompt a new question about the animal’s lifespan.

The Marine Diver measured depth, while the lance pointed toward a timescale hidden in the whale’s body. Later finds of stone or ivory harpoon points in bowhead whales, together with observations of individual whales across human generations, helped scientists reconsider how long whales might live. Those discoveries did not come from the instrument. Their juxtaposition instead clarifies the different routes by which knowledge emerged: deliberate measurement on one hand, and traces preserved in hunted animals on the other.

Significance

The Marine Diver represents a scientific ambition to make the concealed ocean measurable. Yet the surrounding account resists treating an instrument as a complete answer to the sea. Scoresby’s measurements and writings enlarged knowledge of Arctic waters, while the stone lance disclosed an unexpected history that no planned measurement had sought. The pairing gives the object its narrative force: the instrument reaches downward, but the whale carries a record across oceans and through time.