It depends on what your essay says. You don't write the introduction until you've finished the rest of the piece. Make your points, then use the introduction to give a brief overview of what will be said in the essay. The introduction tells readers what to expect, so you have to have the rest of the essay done before you can finish that.
airplanes
In 1903.
Introduction :)
1920
F. G. Irving has written: 'An introduction to the longitudinal static stability of low-speed aircraft' -- subject(s): Longitudinal Stability of airplanes, Stability of airplanes, Longitudinal
brief introduction about myself
before WWI, but fighter planes developed in early WWI.
with a catchy sentence
WHEN SHE WAS A little GIRL.
For the most part , airplanes were piston-driven aircraft until the introduction of the German Luftwaffe's jet-powered Messerschmitt Me 262 Schwalbe (Swallow) and the rocket-powered Messerschmitt Me 163 Komet .
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G. P. Peloso has written: 'Introduction to welding in aeronautical fabrication' -- subject(s): Airplanes, Welding