Latest / Timbuktu: Africa's Forgotten Center of Knowledge — Fexingo History / The Timbuktu Scholar Who Devised a Water Clock
Transcript
- Lucas: So we've talked a lot about Timbuktu's astronomers and mathematicians — al-Wangari, the scholars who studied the stars and calculated the width of the Red Sea. But there's another kind of science that hasn't come up yet: timekeeping. Not just star-gazing, but actually measuring the hours, day and night, with mechanical devices. Luna: I didn't know Timbuktu had mechanical clocks. Lucas: Well, not quite the way we think of them. But yes — there was a scholar named Muhammad al-Kabari, who wrote a treatise on building a water clock. It's not as famous as al-Jazari's automata from 13th-century Mesopotamia, but it shows that the same kind of engineering knowledge reached deep into West Africa. Lucas: Before we get into the details — if you're getting something useful out of these conversations, the way this show stays free and ad-free is listener support. You can find us at buy me a coffee dot com slash fexingo. It's a small thing that lets us keep digging into these stories without any commercial interruption. Luna: Yeah, it really does help. And we're grateful for everyone who's chipped in. Lucas: So al-Kabari's water clock was essentially a clepsydra — a simple principle, really. Water drips from one vessel into another, and as the water level rises, it moves a float that indicates the time. What made his design interesting is that he adapted it to work with the unequal hours that were still common in Islamic timekeeping. Luna: What do you mean by unequal hours? Lucas: In many pre-modern traditions, the day was divided into 12 hours from sunrise to sunset, and the night into another 12 hours. That means an hour in summer is longer than an hour in winter. Al-Kabari's clock was designed to handle that variation, probably by adjusting the flow rate or using different scales for different seasons. Lucas: His treatise, which we only know from a surviving manuscript in Timbuktu, describes the materials — brass bowls, wooden floats, cotton wicks. It's very practical. There's a diagram, too, though the original has faded. Scholars have reconstructed it based on the text. Luna: So this is a working device, not just a theoretical idea? Lucas: Absolutely. The manuscript gives specific measurements and instructions for assembly. It was clearly meant to be built. And it fits into a broader tradition of water clocks across the Islamic world — al-Jazari's famous peacock clock, the clocks in Umayyad mosques, even earlier Byzantine clepsydras. What's remarkable is that al-Kabari was working in Timbuktu around the same time that European clockmakers were beginning to build mechanical clocks with escapements. Lucas: We don't know much about al-Kabari himself — not even his full name. But he studied at Sankore, and his work shows he was familiar with the astronomical tables of al-Zarqali and Ibn al-Shatir. So he was plugged into the same scholarly networks as al-Wangari. Luna: It makes you wonder how many other technological texts are still hidden in those manuscript collections. Lucas: Exactly. The Ahmed Baba Institute holds tens of thousands of manuscripts, and only a fraction have been catalogued, let alone studied. Al-Kabari's water clock is just one example. There are treatises on medicine, mathematics, even a description of a device for measuring the Nile's flood levels. Lucas: This challenges a lot of assumptions. People often think of pre-colonial Africa as a place without written science, without engineering. But here we have a 16th-century scholar designing a precision timekeeping instrument, using materials that were available locally, with knowledge that spanned the Sahara. Luna: What happened to that tradition? Why don't we hear more about it? Lucas: Partly because the manuscripts were hidden and are still being rediscovered. And partly because the political decline of Timbuktu after the Saadian invasion in 1591 disrupted the scholarly community. But the knowledge didn't vanish completely. Some of these devices were probably still in use in the 18th and 19th centuries, even if they stopped being written about. Lucas: One thing that strikes me is how practical al-Kabari's work was. This wasn't just a theoretical exercise — it was meant to help people tell time for prayers, for astronomy, for daily life. And he wrote it in Arabic, which means it could circulate across the entire Islamic world. Luna: So it's part of a global conversation, not isolated at all. Lucas: Exactly. The same questions about timekeeping were being asked in Cairo, in Damascus, in Fez. Al-Kabari was participating in that conversation. And the fact that his clock used water — not weights or springs — shows a continuity with ancient traditions. The clepsydra was used in Egypt and Greece, then refined in the Islamic world, and al-Kabari was adding his own improvements. Lucas: One detail I love is that his manuscript includes a small poem about time: 'Time is a flowing river, and the clock is its vessel.' It's a nice reminder that even engineering texts could be poetic back then. Luna: That's beautiful. And it makes me want to see a reconstruction of his clock. Lucas: Some scholars have built replicas based on the manuscript. There's a working model at the Ahmed Baba Institute, I think. It's not as flashy as a pendulum clock, but it works. And it shows that Timbuktu wasn't just a center of book learning — it was a place where people actually built things. Luna: So what else might we find in those manuscripts? Any other inventions? Lucas: There are references to astronomical instruments like astrolabes and quadrants, and there's even a mention of a device for drawing perspective — something like a camera obscura, though the text is fragmentary. But the cataloguing is slow. Many manuscripts are damaged, and there's a shortage of trained conservators. Lucas: That's why the work of people like Abdel Kader Haidara, who we talked about in episode 104, is so important. He saved thousands of manuscripts from destruction during the jihadist occupation in 2012. But the intellectual work of reading them is just beginning. Luna: It's like a whole library of lost knowledge, waiting to be opened. Lucas: Exactly. And each manuscript is a window into a world we've barely explored. Al-Kabari's water clock is a small piece, but it tells a big story: that Africa's scholars were innovators, not just transmitters. They adapted, improved, and created. Lucas: So next time you look at a clock, think about that water dripping in Timbuktu 500 years ago, marking the hours in a way that was both ancient and new. Luna: I will. Thanks, Lucas.