Obviously, we don't want any plot spoilers for visitors who haven't read 'Resurgence,' those of you who have will know of the significance these two visionary pieces of work play in Mary's first taste of international espionage.
These are hand-drawn designs by the legendary Italian Polymath (someone who knows a lot about lots of different subjects) Leonardo da Vinci, for a fighting vehicle and a helicopter, drawn over 500 years ago.
The fighting vehicle is sometimes described as a prototype of modern tanks, da Vinci's armored vehicle represented a conical cover inspired by a turtle’s shell. The covering was to be made of wood and reinforced with metal plates that add to thickness. The machine was powered by two large inside cranks operated by four strong men. The vehicle was equipped with an array of light cannons, placed around the perimeter.
His sketch for a rotorcraft, also known as the "Helical Air Screw" or simply the "airscrew", from the late fifteenth century is widely regarded as the predecessor to the modern day helicopter. As with many of da Vinci’s ideas, he never actually built and tested it – but his notes and drawings mapped out exactly how the device would operate.
"If this instrument made with a screw be well made – that is to say, made of linen of which the pores are stopped up with starch and be turned swiftly, the said screw will make its spiral in the air and it will rise high."
In other words – the device was designed to compress air to obtain flight – similar to today’s helicopters, and would have been powered by four men standing on a central platform turning cranks to rotate the shaft.
Unfortunately, due to weight constrictions, modern scientists do not believe da Vinci’s invention would have been able to take flight... yet.