Leonardo Da Vinci Helical Air Screw Helicopter Design Vintage Trade Ad Card

Description

Leonardo Da Vinci Helical Air Screw Helicopter Design Vintage Trade Ad Card
NOTE:
THESE ARE NOT POSTCARDS
THEY ARE TRADE/ADVERTISING CARDS.
THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD
AND
THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY
2 3/4 '' x  2 ''  or  7 cm. x  5 cm.
ORIGINAL VINTAGE ADVERTISING CARD
LEONARDO DE VINCI HELICAL AIR SCREW HELICOPTER DESIGN
Though the first actual helicopter wasnt built until the
1940s, it is believed that Leonardo da Vincis sketches
from the late fifteenth century were the predecessor to
the modern day flying machine. As with many of da
Vincis ideas, he never actually built and tested it - but
his notes and drawings mapped out exactly how the
device would operate.
Da Vinci scrawled next to his sketches of the screw-like
machine the following description: "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."
Also known as the "Helical Air Screw" or simply the
"airscrew", the device was designed to compress air to
obtain flight - similar to todays helicopters. Da Vinci
was a big proponent of the many possibilities offered by
the screw shape, and he used the shape for other
inventions and designs as well.
THE REVERSE SIDE HAS FRENCH AND DUTCH TEXT
ABOUT THE IMAGE ON THE FRONT SIDE
THIS IS PRINTED ON 'NORMAL' PAPER NOT  ON CARD STOCK
SEE IMAGES ABOVE
THE CARD DIMENSIONS ARE APPROXIMATELY
2 3/4 '' x  2 ''  or  7 cm. x  5 cm.
NOTE:
THE IMAGE ABOVE IS LARGER THAN THE CARD
TO SHOW THE DETAIL.
THE CARD IS NOT A MODERN REPRODUCTION AND IT IS NOT PERFECT
IT IS PRINTED ON 'NORMAL' PAPER NOT  ON CARD STOCK
THERE MAY BE:
SLIGHT PAPER LOSS - SMUDGING - ROUNDED CORNERS - WEAK CORNERS
SEE THE IMAGES ABOVE!
2
WE COMBINE SHIPPING
BUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS
BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREE
NOTE:
ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERD
MAIL AND WILL SPLIT THE COST WITH THE BUYER.
INQUIRE IF CONCERNED!