Column still
A column still is a distillation apparatus built around one or more vertical columns. Its continuous and rectifying designs appear in several spirits traditions, but materials and product character vary by installation.
Equipment · Tanks and vats
Baking trough
In Swedish breadmaking, a wooden trough could hold sourdough between bakes; dried dough on its walls could be revived for the next bake. A museum example from Björnlunda documents one traditional form.
A place for the next leaven
Before baker’s yeast became commonplace, sourdough was the ordinary leaven for Swedish rye bread. The Swedish Institute for Language and Folklore describes dough-trough souring: dough fermented in the trough, and sourdough dried onto its surface could be revived when the household baked again. The trough therefore served as a place to keep the next leavening alive between baking sessions, rather than merely as a mixing bowl. This account documents a practice, not a universal schedule or a measured starter recipe.
Yeast changed this routine gradually. Pressed yeast began to be used in the late eighteenth century and became common only later in the nineteenth. That history helps date a change in breadmaking, but it does not date any particular trough or prove when the wooden form first appeared.
Sources for this section
A documented wooden form
Sörmlands Museum catalogues a wooden dough trough, SLM 38846, from Björnlunda in Södermanland. The collection description records a long, open body with high sides, dovetailed joints, a raised foot and ends that taper and round upward; it also notes metal fasteners in places. These details describe this museum example, not a required pattern for every Swedish trough. The catalogue identifies wood but does not name its species, give dimensions or capacity, or date the object.
The museum photograph shows the empty vessel. It is useful evidence for the shape of SLM 38846, while the separate Matkult account supports the sourdough function. The two records do not establish that this exact object was used for the sourdough process described in the bread history.
Sources for this section
What the record can and cannot tell us
The documented practice ties the baking trough to Swedish sourdough bread, while the museum object's catalogue anchors one example to Björnlunda. Neither source establishes a single birthplace for troughs, a standard capacity, a particular wood, a cleaning method or how a present-day reader could obtain one. No performance claim about temperature, airflow or microbial residence follows from the available description. The sound conclusion is narrower: a wooden trough could hold dough, and in the reported tradition dried sourdough on its surface could be brought back into use at the next bake.
Sources for this section
History
The inspected sources document Swedish sourdough trough practice and a museum object but do not date the equipment type or the SLM 38846 example.
Equipment details
PowerNo power A trough is a passive vessel; the cited descriptions record no powered operation.
How you get oneNot established The sources document historical use and a museum-held example, but do not establish present-day makers, availability or a usual way to acquire one.
CareThe historical account describes dough drying onto the trough and being revived for a later bake. It does not specify washing, seasoning, or modern food-safety care, so no cleaning regimen can be inferred from it.
Made of
- wood — vessel body
The Sörmlands Museum example SLM 38846 is catalogued as wood; the species is not specified. Its recorded form has high sides, dovetailed joins, tapered rounded ends and a raised foot. - metal — fasteners
Metal is also recorded for SLM 38846; the collection description notes some metal fasteners. This applies to that example, not every dough trough.
Limits
No standard capacity or dimensions are established.
Source →Places
Sweden
Traditional use · Country evidenceMatkult documents sourdough kept and revived in a baking trough in Sweden; it does not locate that practice to one locality.
Björnlunda
Historical attestation · Locality evidenceLocality of the museum's SLM 38846 wooden dough trough; this is an object's catalogue provenance, not proof that all troughs came from here.
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Sources
Institutet för språk och folkminnen (Isof), MatkultHistory · Use
Om jäst och jäsningSourdough was common before baker's yeast became widespread; Swedish rye-bread leavening used sourdough.
Matkult describes dough-trough souring and revival of dried sourdough from the trough at baking time.
Pressed yeast was introduced in the late eighteenth century and became common later in the nineteenth century.
Cited in: A place for the next leaven; A documented wooden form; What the record can and cannot tell us
Sörmlands museumForm · Materials · Geography · Visual reference · Image rights
SLM 38846 – DegtrågMuseum catalogue identifies a wooden dough trough from Björnlunda, Daga, Södermanland, Sweden; wood and metal are recorded.
Collection description gives its elongated form, high sides, dovetailed construction, raised base, tapered rounded ends and metal fasteners.
The record states the image is CC0/no rights reserved. It does not provide a date, dimensions, capacity or wood species, or establish use of this particular object for sourdough.
Cited in: A documented wooden form; What the record can and cannot tell us