LOC's Public Domain Archive
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![[Details of the mechanisms of the Leibniz calculator, the most advanced of its time]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE3MjcvMDEvMDEvZGV0YWlscy1vZi10aGUtbWVjaGFuaXNtcy1vZi10aGUtbGVpYm5pei1jYWxjdWxhdG9yLXRoZS1tb3N0LWFkdmFuY2VkLW9mLWl0cy0xMDI0LmpwZw%3D%3D/40/49/webp "[Details of the mechanisms of the Leibniz calculator, the most advanced of its time]")