Casting Notes: Iron Core, Firing Holes, and a Jack
Founding a hollow piece with an iron core, notes on firing, and the name Pandolfino
Beside a lettered figure Leonardo directs that a be an iron rod filling the whole void a b when the piece is cast, so as to resist the collapse of the mould, adding that it should be buried once well fired. Two inverted notes lower down read 'to give fire' and 'drives fire in 2 places, tail,' pointing to the ignition of a cast charge or firearm. The right-hand page also carries a small roller-and-bar mechanism, a cylindrical barrel-like form, and a large arc-and-line construction, while the surname 'Pandolfino' is jotted alone among the drawings. The sheet is faint under transmitted light.
On this page
Iron core to fill the void a b and keep the mould from collapsing
A note beside the figure directs that a be an iron rod which fills the whole void a b when the piece is cast, so that it resists the collapse of the mould. It adds that the piece is to be put underground once it is well fired.
Firing notes: 'to give fire' and 'drives fire in 2 places, tail'
Two inverted memoranda lower on the sheet read 'to give fire' and 'drives fire in 2 places, tail.' They point to the ignition of a cast charge or firearm, set beside a cylindrical barrel-like form.
Roller-and-bar mechanism and arc construction
The upper part of the sheet carries a small mechanism of two rollers linked by a bar, alongside a large faint construction of arcs and ruled lines. These are drawn without transcribed lettering.
The surname 'Pandolfino'
The single word 'Pandolfino,' a Florentine surname, is written alone on the sheet among the technical drawings and casting notes. It stands as an isolated jotting unconnected to the surrounding figures.