Spherical Weights on Inclined Planes; a Two-Hammer Bell
Percussion of a falling sphere between unequal angles, with a bell-striking device
The page studies a spherical weight falling onto an oblique surface: it strikes between unequal angles, and its percussive power on one part is double that enclosed in the smaller angle. A construction (a - d - r p q - b - e) sets the sphere on an inclined plane within a quarter-circle inscribed in a square, with an analogous figure repeated below. At the lower left a mechanism is sketched for a bell struck by two hammers driven by a wound cord.
On this page
Percussion of a sphere on an oblique plane
A heavy body falling onto an oblique site strikes between unequal angles. Leonardo states that the percussion of the spherical weight on such an oblique site has, on one part, double the power of that enclosed within the smaller angle.
Sphere and quarter-circle inscribed in a square
The falling sphere is set out on an inclined plane (a - d - r p q - b - e) within a quarter-circle sector inscribed in a square, with an 'analogous figure' drawn below to repeat the construction.
Bell struck by two hammers
A separate sketch shows a device for a bell struck by two hammers, worked by a wound cord (corda avvolta). It is a mechanism note distinct from the inclined-plane study above.