The engineer has certain disadvantages compared to the other professions. His works are out in the open where all men can see them. He cannot deny he did it. The doctors’ mistakes are buried in the grave. The voters forget when the politician changes the alphabetical names of his failing projects. The trees and ivy may cover the architects’ failures. The lawyers can blame the Judge or the Jury. Unlike the clergyman, the engineer cannot blame his failures on the devil.
Moreover, if his works do not work, he is damned.

The engineer’s work is out in the open where all men can see it. If he makes a mistake, he cannot, like the doctor, bury it in a grave. He cannot, like the architect, obscure it by trees and ivy. He cannot, like the lawyer, blame it on the judge or jury. He cannot, like the politician, claim his constituents demanded it. Nor can he, like the public official, change the name of it and hope the voters will forget. Unlike the clergyman, he cannot blame it on the devil. Worse still, if his works do not work, he is damned.

Again, it is well to observe the force and virtue and consequences of discoveries; and these are to be seen nowhere more conspicuously than in those three which were unknown to the ancients, and of which the origin, though recent, is obscure and inglorious; namely, printing, gunpowder, and the magnet. For these three have changed the whole face and state of things throughout the world; the first in literature, the second in warfare, the third in navigation; whence have followed innumerable changes; insomuch that no empire, no sect, no star seems to have exerted greater power and influence in human affairs than these mechanical discoveries.
[tr. Spedding (1858)]

Again, it is well to mark the force, virtue, and consequences of discoveries; and these occur nowhere more manifestly than in those which were unknown to the ancients, and whose origin, though recent, is obscure and inglorious; the Arts, namely, of Printing, of Gunpowder, and the Mariner's Compass. For these three have changed the face and condition of things all over the world; the first in letters, the second in war, the third in navigation. And hence numberless changes have followed; so that no government, no sect, no star, seems to have exercised greater power and influence over human affairs than these mechanical discoveries.
[tr. Johnson (1859)]

Again, it helps to notice the force, power and consequences of discoveries, which appear at their clearest in three things that were unknown to antiquity, and whose origins, though recent, are obscure and unsung: namely, the art of printing, gunpowder and the nautical compass. In fact these three things have changed the face and condition of things all over the globe: the first in literature; the second in the art of war; the third in navigation; and innumerable changes have followed; so that no empire or sect or star seems to have exercised a greater power and influence on human affairs than those mechanical things.
[tr. Silverthorne (2000)]

Notice the vigour of discoveries, their power to generate consequences. This is nowhere more obvious than in three discoveries that the ancients didn’t know and whose origins (all quite recent) were obscure and humdrum. I am talking about the arts of printing, gunpowder, and the nautical compass. These three have changed the whole aspect and state of things throughout the world -- the first in literature, the second in warfare, the third in navigation -- bringing about countless changes; so that there seems to have been no empire, no philosophical system, no star that has exerted greater power and influence in human affairs than these mechanical discoveries.
[tr. Bennett (2017)]

Of course, you can build the Air Ministry an airplane with whatever characteristics you want -- as long as you don't necessarily expect it to fly.