Sword Records: Oakeshott Types and Blade Steels

How does the Oakeshott typology classify medieval swords?

Oakeshott's system sorts swords by the geometry of the blade: its length, its width at the base and near the point, the profile of the edges, and the cross-section, whether lenticular, flattened diamond, or hollow-ground with a fuller. The types are numbered X through XXII, and the sequence is broadly chronological, though Oakeshott himself warned against treating it as a rigid timeline. A type X blade, for instance, is a broad, relatively parallel-edged weapon with a wide fuller, characteristic of the late Viking age and the early medieval period. A type XIII is wider still, with edges that curve more noticeably. By type XV and XVIII the blade narrows and the point becomes more acute, suited to thrusting against mail. Type XX and XXII belong to the later Middle Ages and the Renaissance, with longer grips and more slender profiles.

The classification is descriptive, not diagnostic. Two swords of the same type can differ in hilt, inscription, or inlay, and the type says nothing about where a blade was made or by whom. That is why museum catalogues pair the Oakeshott type with other evidence: the form of the pommel, the shape of the crossguard, the presence of a maker's mark, and the archaeological context if one exists. For a regional archive, the value of the system is that it gives a common language. A blade recorded in a county collection can be compared with one held elsewhere without either institution having to adopt the other's private shorthand.

What is pattern welding and how does it differ from crucible steel?

Pattern welding is a forge-welding technique. Iron or steel bars of differing carbon content are stacked, twisted, and welded together at high temperature, then drawn out into a blade. The resulting surface shows a visible pattern, often a ripple or a herringbone, because the layers corrode and polish at different rates. It is a composite construction, built up from several pieces of metal, and it depends on the smith's control of heat and flux. The pattern is not decoration applied to the surface; it is the structure of the blade made visible.

Crucible steel is a different route to a similar visual end. Iron and carbon are melted together in a sealed crucible, producing a homogeneous ingot with a high carbon content. When that ingot is forged and cooled in a particular way, the carbide bands that form create a watery, damask-like pattern. The historical South Asian product known as wootz is the best-documented example, and its patterned descendants in the Middle East are often called Damascus steel in older literature. The key difference is the starting point: pattern welding assembles a blade from separate bars, while crucible steel begins with a single molten mass. A pattern-welded blade can be made from bloomery iron, the spongy product of a pre-industrial smelting furnace, whereas crucible steel requires a furnace hot enough to melt the charge completely.

Both techniques appear in European contexts, though not equally. Pattern welding is well attested in early medieval northern Europe, including the Viking age, and it is often found in swords of high status. Crucible steel is more commonly associated with South Asian and Middle Eastern production, and its presence in Europe is a matter of trade, import, and occasional local experiment. For a collector or a reader of excavation reports, the distinction matters because it changes what the metallography will show. A pattern-welded blade reveals its layers under etching; a crucible steel blade reveals a banded structure that comes from solidification, not from assembly.

Why do fingerprints and humidity matter for a stored blade?

Iron and steel corrode when water and oxygen reach the surface, and both are present in ordinary air. Humidity accelerates the process because a thin film of moisture on the metal allows electrochemical reactions to proceed. In a storage room, the danger is not a visible drip but a persistent relative humidity above the threshold where condensation begins to form on cool metal. Once that film exists, chlorides from handling and dust can start pitting, and pitting is irreversible: it removes metal rather than merely discolouring it.

Fingerprints are a specific hazard because skin deposits salts, oils, and moisture in the exact pattern of the ridge. On a polished blade, that deposit etches a mark that can become permanent within days in a damp environment. Museum practice therefore treats bare-hand contact with iron and steel as a controlled operation: nitrile gloves, a clean surface, and a record of who handled the object and when. The same logic applies to display. A sword mounted in a case with poor air circulation, or near a source of moisture such as a stone wall, will corrode faster than one kept in a stable, dry cabinet.

How do collections store iron and steel?

Public collections in Europe generally store ferrous objects in conditions that limit both humidity and handling. The usual measures are a controlled relative humidity, often below fifty per cent for archaeological iron, inert or acid-free packaging, and physical support that avoids stress on thin or corroded sections. Where a blade has active corrosion, conservators may use a desiccant in a sealed container and monitor the object at intervals rather than treat it immediately. Treatment itself, whether chemical stabilisation or mechanical cleaning, is a decision made with the object's history in mind, because cleaning can remove evidence of manufacture.

Storage also involves documentation. A blade in a drawer is only useful to research if its type, dimensions, condition, and provenance are recorded. That is where a descriptive system such as Oakeshott's earns its place: it allows a curator to note that a sword is a type XVIII with a particular pommel form, and for a reader elsewhere to understand what is meant. The same is true of the Viking-age hilt classifications associated with Petersen, Wheeler, and Geibig, which describe pommel and guard forms in a comparable way. A register that gathers these schemes, together with the metallurgy and the conservation vocabulary, is a working tool rather than a catalogue of treasures.

What should a reader take from a documentary register?

The value of a register is that it keeps uncertainty visible. A type assignment is an interpretation, not a fact. A pattern-welded structure may be original or may be a later repair. A blade's steel may be bloomery iron, crucible steel, or a mixture that no single label covers. Good documentation says which claims rest on metallography, which on stylistic comparison, and which on nothing more than a dealer's description.

For anyone working with a local collection in the Upper Ottawa Valley, the practical steps are modest. Record dimensions in millimetres. Note the cross-section and the presence of a fuller. Photograph the hilt from several angles in diffuse light. Keep the object dry, handle it with gloves, and write down what you did. The classification systems and the conservation rules are not separate subjects; they meet in the same drawer, on the same label, and in the same record.