Instructions for the Management of Harvey's Sea Torpedo

In Short

This technical handbook provides clear instructions for storing, assembling, launching, and deploying Commander Frederick Harvey's specialized sea torpedo. Designed to be towed behind fast steamships, these explosive devices diverge outward at sharp angles, diving or surfacing dynamically to strike target vessels directly beneath the waterline. Through meticulous descriptions of copper casings, spring-loaded safety keys, mechanical and electric detonators, and night-attack maneuvers, the manual details how small, light vessels can systematically neutralize heavily armored ironclads. It stands as a fascinating artifact marking a pivotal transition point in modern naval warfare and technology.

The Story

The text opens with a straightforward practical premise: while personal, hands-on instruction in the water is the best way to master naval weaponry, a thorough written guide can adequately convey the necessary technical skill. The narrative introduces the core apparatus—a paired set of port and starboard sea torpedoes. These outer casings, constructed from seasoned, pitch-cemented elm and lined with watertight copper, are engineered to contain high explosives ranging from gunpowder to dynamite and gun-cotton.

From this basic structural blueprint, the manual progresses into the intricate mechanical setup required to render the weapon both safe and lethal. The operational heart of the system rests in the exploding bolt and its associated levers. Kept safe during storage by thread-bound safety keys and brass protective guards, the bolt must be carefully lubricated with a custom blend of hog's lard, beeswax, and neat's-foot oil. Once launched, the device relies on side and top levers that, upon direct, hugging contact with an enemy hull, drive the central firing bolt downward onto a steel pin to detonate the primary charge.

The text then shifts from static mechanics to active seamanship, detailing deck preparations, rigging, and launch procedures. Crew members hoist the heavy devices, attach cork buoys to manage flotation, and pay out line through dedicated deck brakes. The torpedo’s angled slings and small stern rudder force it to diverge away from the attacking vessel's wake at angles up to forty-five degrees, keeping the towboat clear while the explosive sweeps toward its target.

Building upon these operational mechanics, the manual presents a series of tactical engagements. It outlines nine distinct scenarios for attacking enemy ships—whether moored, anchored, or underway at sea. The optimal strategy relies on speed, stealth, and darkness. By approaching enemy ships at night, a fast torpedo vessel can cross an opponent's bow or pass along its flanks, letting the taut tow-line drag the underwater charge directly under the target’s unarmored hull or keel.

Finally, the text concludes with a broader vision for future naval warfare. Recognizing that traditional cannon-armed warships are uniquely vulnerable to stealthy, low-cost sub-surface attacks, the author proposes a new class of specialized warship: a 400-ton, flush-decked, twin-screw steam schooner built specifically to deploy these weapons. Ultimately, the work predicts that the advent of cheap, lethal torpedoes will permanently alter global maritime power, forcing navies away from massive ironclads and toward fast, specialized torpedo craft.

How It Unfolds

The mechanical foundation The manual outlines the construction of port and starboard torpedo cases, detailing their wooden exteriors, copper linings, internal bursting tubes, and explosive capacity.

Preparing the detonator Instructions focus on setting the exploding bolt, adjusting stuffing-box thread pressure, applying lard-and-wax lubricant, and securing safety keys with thread.

Deck gear and launch The guide details how to rig yards, adjust hemp slings, attach cork buoys, and control tow-lines using deck-mounted friction brakes.

Executing the attack Step-by-step procedures explain how to launch the weapon, manage line tension to prevent unwanted diving, and steer the diverging tow-rope into an enemy hull.

Tactical maneuvers The text walks through nine tactical cases, demonstrating how to strike anchored or moving targets, cross enemy bows, and escape when pursued.

The future warship The author proposes a blueprint for a sleek, fast, 400-ton steam vessel, arguing that torpedoes will shift naval warfare toward small, specialized craft.

The People

Commander Frederick Harvey, R.N. The inventor and author who seeks to provide a definitive manual for his sea torpedo. He wants to prove that his weapon offers a reliable, low-cost method to disable massive ironclads, driving naval tactics toward fast, specialized torpedo vessels.

Captain A. Hood, R.N. The Director-General of Naval Ordnance, who contributes a key practical safety feature to the design. He suggests adding a removable brass guard over the exploding bolt to prevent accidental detonation if a crewman improperly installs the bolt without its safety key.

Captain C. A. McEvoy An inventor who contributes an alternative electrical circuit-closer for the torpedo. His mechanism replaces the purely mechanical firing pin with an internal spring-and-bridge system, allowing the torpedo to be detonated electrically via an insulated wire running through the core of the tow-rope.

In Its Own Voice

"The sea torpedo has the advantage of exploding only when in hugging contact with the vessel attacked; the levers by which it is exploded are so placed in relation to the tow-rope, that either the side or top lever is found invariably to act effectively..."

This passage lays out the core mechanical principle of the weapon, emphasizing that detonation depends entirely on physical impact against the target hull.

"The torpedo must be closing to the ship when the levers are acting and the bolt descending; no experiment for the force of explosive agents, with a cushion of water intervening, is required."

Here, the author highlights the practical efficiency of his invention, noting that eliminating water cushions between charge and hull maximizes destructive power.

"When it shall have been clearly demonstrated, in actual war, that large vessels can be disabled or destroyed by small vessels, with something like impunity, torpedo warfare will then take another form..."

This closing observation reflects the author's forward-looking strategic vision, anticipating how sub-surface explosives would permanently transform global naval doctrine.

What It's Really About

Beneath its dry, practical formatting, the manual argues for a fundamental shift in naval power. Written at a time when major empires were investing heavily in massive, expensive, cannon-laden ironclads, this book demonstrates how simple engineering and asymmetric tactics can neutralize superior force. It addresses the tension between mechanical complexity and operational reliability, repeatedly favoring straightforward physical mechanisms over delicate electrical systems. Through its precise instructions, the text frames naval warfare not as a contest of monumental firepower, but as an exercise in calculated speed, stealth, and specialized mechanical utility.

Why Read It Today

This handbook appeals to military historians, naval enthusiasts, and readers curious about the mid-nineteenth-century industrial revolution. Rather than offering abstract theory, the text provides a vivid, highly granular look at vintage technology in action—from greasing brass bolts with hog's lard to managing cork buoys and friction brakes on a rolling deck. It conveys a strong sense of period atmosphere, illustrating how sailors adapted traditional seamanship to accommodate high explosives like dynamite and compressed gun-cotton.

Readers should be prepared for an unadorned, purely technical reading experience. The text consists entirely of instructional lists, exact measurements, dimension tables, and stark tactical directives, completely lacking narrative narrative embellishments or character dialogue. However, for those interested in historical engineering or the origins of modern subsurface warfare, the manual offers an authentic, fascinating glimpse into the precise moment when naval strategy began its shift toward modern torpedo tactics.