How a 19th-century engineering quirk still flickers on a hidden alley beside the Savoy
Victorian London’s “sewer gas destructor” was a cleverly engineered street lamp designed to draw methane and other noxious sewer gases upward and incinerate them in an open flame. Credited to Birmingham engineer Joseph Webb in the late 19th century, the device had a dual purpose: lighting dark streets while neutralizing the foul, potentially explosive gases building up beneath them.
One common misconception, however, is worth clearing up. The lamp does not run on sewer gas. It is primarily fueled by town gas, which produces a constant flame that draws in sewer gas and burns it off as a byproduct. The sewer gas is destroyed, not the power source.
Where to find London’s “Fart Lamp”
As explained here, the sole surviving working example stands on Carting Lane, a narrow alley tucked beside the Savoy Hotel just off the Strand in Westminster. The lane’s colorful backstory has earned it the nickname “Farting Lane” among tour guides, bloggers, and social media enthusiasts alike.
After a reversing lorry struck the original lamp and damaged it beyond repair, a fully functional replica was installed in its place. It serves both as a working gas lamp and as a sewer vent. Beneath the street, a domed chamber in the sewer roof collects methane-rich gas and channels it up through the hollow lamp post to the burner above.
How the Victorian sewer gas lamp works
At its core, the lamp burns a town-gas flame at roughly 700 degrees Fahrenheit inside the lamp head. The intense heat generates a powerful updraft, which pulls sewer gas up from below and into the fire, where it is safely combusted above street level. A single lamp of this type can ventilate up to three-quarters of a mile of sewer.
Early prototypes attempted to run entirely on sewer gas, but the supply proved too inconsistent to sustain a reliable flame. Engineers subsequently settled on the “dual-fuel” configuration still in use today—a steady mains-gas flame supplemented by whatever sewer gas happens to be available.
Why Victorian London needed sewer gas destructors
The rapid expansion of London’s sewer network in the Victorian era created an unintended problem: vast quantities of trapped gas that reeked, threatened public health, and posed a genuine explosion risk. Webb’s lamps offered an elegant solution — streets would be lit while the dangerous gases were simultaneously vented and destroyed.
The lamps were adopted across several London boroughs, with Westminster, Hampstead, and Shoreditch among those believed to have installed them. Their reign was relatively short-lived, however. As electric street lighting became widespread and sewer ventilation technology advanced, the gas destructor lamp gradually fell out of use.
The carting lane lamp today
The Carting Lane lamp now functions as a living piece of engineering history, drawing a steady stream of curious visitors and featuring prominently on walking tours and social media. Local lore—enthusiastically repeated by tour guides—holds that the Savoy Hotel’s plumbing feeds into the same sewer system, meaning a trace of guests’ waste may ultimately find its way into the lamp’s flickering flame.
More than a curiosity, the lamp stands as a testament to Victorian ingenuity: an era when engineers turned one of the city’s most unpleasant problems into a practical and illuminating solution. Despite its irreverent nickname, the “fart lamp” of Carting Lane offers a genuine glimpse into a time when necessity drove invention—and gaslight still held the dark at bay.