Spring-powered military engines and an ignition device
Red-chalk studies of wheeled spring engines, with a small device noted 'to give fire'
The sheet is covered in red-chalk studies of wheeled military engines, showing bundled leaf-springs or bow-arms mounted on carriages with large wheels, drawn from several angles together with framed housings. A note at the left labels a small device 'to give fire' — an ignition mechanism. The larger engines are drawn but not described in the transcription, and further untranscribed detail is present across the leaf.
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Wheeled spring engines
Several studies show a military engine built on a wheeled carriage, with a bundle of leaf-springs or bent arms driving against a large wheel or drum. The device is drawn in plan and in raised positions, with a framed housing sketched at the lower right.
Small device 'to give fire'
A small mechanism at the left is annotated as a device 'to give fire' — an igniter for setting a charge or fuse alight.