Before De Zwaluw there was De Windlust - The Desire for Wind - a smock mill built in 1841 for Douwe Dirks Drukker of Burum, standing twenty metres to the west of the current site. It ground corn for four decades and then was replaced. De Zwaluw rose nearby as a combined corn and pearl barley mill, commissioned by Klaas Steenhuizen and put up by the millwright G R van Wieren of Smitshuis. Steenhuizen had four sons, two of whom went to work in the mill their father had built: Paulus on the pearl barley stones, Jan running the sawmill that was eventually fitted alongside. Between 1875 and 1878 the base of a paltrok mill - a horizontal, rotating sawmill of distinctly Dutch design - was set up next to De Zwaluw and driven by it through a shared shaft. One mill, two trades.

What made De Zwaluw quietly significant in its day was the sail. Most Dutch mills of the 1880s still flew Common sails: cloth stretched by hand over wooden lattices, requiring the miller to climb out and reef them whenever the wind changed. Patent sails, invented by the Englishman William Cubitt in 1807, replaced cloth with hinged shutters that could be adjusted from inside the cap while the mill ran. De Zwaluw was among the first mills in the northern Netherlands fitted with them from new. After one of its later restorations the mill briefly carried a mismatched set - two Common, two Patent - before the Patent set was fully restored. Today all four sails span 23.60 metres, hinged shutters open and close, and the miller no longer has to climb out into the weather.

Mill people use specific words for specific things. De Zwaluw is an achtkante stellingmolen - an eight-sided smock mill with a stage. The base is brick, rising five storeys to the stage itself at fourth-floor level. Above that the smock is octagonal timber, thatched, capped with another thatched dome that the miller rotates by hand using a long tailpole and winch outside the cap. The current windshaft, the heavy iron axle that the sails turn, was cast in 1985 by the Ijzergieterij Versteeg-Ensink foundry in Hardinxveld-Giessendam. It was the first windshaft that foundry ever made. The geometry was being preserved, but the components themselves were being renewed - a typical pattern for a working monument, where everything that can wear out eventually does.

Most Dutch windmills surviving today survive because someone made the long decision to keep them running. De Zwaluw is owned by the former Gemeente Ferwerderadiel, now folded into Noardeast-Fryslân, but the daily life of the mill belongs to the miller. Through the open season, from 1 May to 1 October, visitors can climb up Tuesday to Saturday between 10:00 and 12:00 or 13:30 to 17:00, and watch the stones turn. The mill is Rijksmonument number 15585 - one of the long list of Dutch national monuments protected by law. The list is meaningful, but it is the daily grinding that keeps De Zwaluw from sliding into the silent category of beautiful objects.

From the Dokkumer Ee canal, where most of Burdaard's life still happens, the silhouette of De Zwaluw is the village's exclamation point. Together with the smaller De Olifant - the Elephant - on the other side, the two mills give the linear riverside village a sense of vertical scale that you do not find in many polder settlements. The Swallow is a name that rewards a moment of pause. Swallows are migratory birds that come back every year to the same eaves. They depend on continuity and the patience of others. The mill is a fair namesake.