Shapes
Classification of Pipe Shapes
An entry explaining how pipe shapes are named, how they group by family logic, and how factory shape-number and group systems work.
The classification of pipe shapes is the name for the effort to bring order to the confusion caused by different manufacturers calling the same form by different names. Shape names in pipe making have never, in any period, been tied to a standards body; names have become established by passing from workshop to workshop, catalog to catalog.
For this reason, three separate levels are used together when describing a pipe: the traditional name, the body's stance, and the manufacturer's own number. The classic pipe shapes entry gives the repertoire of these names, while this entry addresses the system itself.
Family Logic
Shapes are thought of not individually but in rings of kinship. By common consensus the starting point is Billiard: forms like Lovat, Liverpool, Canadian, Lumberman, Pot, Panel, Apple, and Dublin are considered derivatives of the same basic body, obtained by altering proportion, shank length, and mouthpiece (stem) arrangement. Describing a shape therefore takes more than memorizing its name; measurable traits such as the degree of the bowl's (bowl) taper, wall thickness, shank cross-section, and heel shape are what actually distinguish it. The terms in the pipe anatomy entry are the shared language for these measurements.
The second axis is stance. The straight and bent distinction isn't a shape in itself but a qualifier placed in front of an existing shape; Bent Billiard and Billiard are two states of the same family. Bodies that step entirely outside classic molds, meanwhile, are gathered under the freehand heading and are referred to not by shape name but by their designer's signature.
Factory Numbers
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Source: Pipedia, adapted under the CC BY-SA licence.