I could not tell him.
"I shall refresh your lost memory. Is there not a certain bottle or globe, exhausted of air—and a wire of some substance set glowing within—"
I clutched his arm, so suddenly fierce that he broke off and swore in startled pain.
"How do you know that?" I demanded. "Yes, I had forgotten entirely. But you knew, and about airplanes as well!"
"Let me go," he commanded. "Here come Lorenzo's grooms with our horses."
We accepted our mounts, and rode away side by side.
"Now," said Guaracco, as we entered a dim street, lighted only by the lanterns of a watch patrol, "you will remember that I showed you a pearl, a beautiful jewel? And it put you to sleep?"
"You mean that in my trance I remembered—"
I could see how possible that was. Meanwhile, I braced my spirit lest he try some other occult trick. But he only nodded, as if to check the point.
"I learned things about your science which you yourself cannot grasp when awake. You shall look into the pearl again, Leo, and more knowledge will creep forth. We shall produce wonders for Lorenzo, winning great favor and possessions, and also build your time reflector. Nay our time reflector—for perhaps I shall make the journey through the ages with you."
He was swaying me very strongly but still I resented his absorbing mastery of every situation. He seemed to read my mind.
"Let us not be lord and servant any more," he offered, "but colleagues and friends. Lorenzo is disposed to grant us money for a shop of our own. Stay on with Verrocchio lest others become suspicious. But your spare time can be applied to our own profit." His voice became sly. "Lisa asks after you, lad. She would be pleased to see you again. And, for all your last words to her, I think you would be pleased, too. Is it not so?"
Finally I agreed to a truce and a partnership. After all, it was the only way to escape from the Renaissance. And Guaracco's concessions seemed handsome, at the time.
On the following day I skimped my work with Verrocchio, and called on Guaracco at the little house where once he had tried to bestow Lisa upon me. Lisa was there, shy but apparently glad to see me. How had I been able to admire Simonetta Vespucci so greatly, only twelve hours before I could not understand. But I did my best to conceal my feelings. Guaracco must not bring that influence to bear upon me a second time.
As at his house in the country, Guaracco had fitted up the cellar for laboratory and workshop. At once we began work on the "explosive shot" which Lorenzo had demanded.
At my recommendation we made it cylindrical instead of round, a good eighteen inches long and six in diameter. Bronze, being light, strong and workable, was our choice for the outer shell of this bomb, and I cut deep cross lines in the outer surface so that it might the more easily explode and fly in pieces. The inside we filled strategically with lumps of lead, with spaces between for powder.
Guaracco, though helpful, was as puzzled as Giuliano de Medici about the delay in explosion. To be certain of that delay, I mixed a slow-burning powder, with charcoal of willow wood only lightly burnt. The completed mixture was no more than dark brown in color, and a noticeable interval of time was needed for its ignition. Of this slow-burning powder I made a fuse or match, which led through a hole in the rear part of the bomb.
"The discharge from the cannon will ignite the match," I explained, "and the explosion will come in as short a space as you would take to say an Ave Maria."
"Say an Ave Maria for the souls of those it strikes." Guaracco laughed with cruel relish.
We also made a more elaborate bomb, its curved sides pierced with muzzles from which bullets could be thrown by the explosion. When both were finished— we took only a morning and an afternoon—Guaracco recommended that we wait before presenting them to Lorenzo.
"I take a parable from the construction itself," he admonished me. "Delay the explosion of this wonder. It will be the more effective with His Magnificence. Remember, also, that when you have given him the explosive shot, he will demand at once the flying machine."
That was excellent advice, for I was still muddled in my plan to build man-lifting wings, and Guaracco could not—or would not—help me.
I therefore went into the trading centers of Florence, to shop for materials. My teacher Andrea Verrocchio, who had heard little of my problem, suggested as framework the wood of Spanish yew which was employed by the archers of England for their superb longbows, and was undoubtedly the strongest and lightest wood as to be had. I purchased a bundle of such staves which I thinned and shaped by careful whittling, and procured strong silk cloth for the fabric.
My best model, as it seemed to me, would be the wing of a bat. I went so far as to snare and kill several birds—sorrowfully, for I love animals—and, by manipulating their wings and bodies, I found out certain principles of flight. These I demonstrated by small-scale models, to be hung on threads and made to simulate flying by a strong blast of air from a bellows. A new problem added itself to that of the wings—the construction and manipulation of the tail as a rudder. I sketched a design like a fan, which I hoped to control by pressure and motion of the feet.
Guaracco professed a great deal of interest in this work of mine, which took up all my spare time for several days. His interest seemed to partake a little of superior amusement, as though he foresaw failure. But Lisa was kindly and admiring, and even helped in the sewing of the fabric, which needed a woman's skill. I joined the ribs of the wings and tail myself, with looped pieces of leather at the junctures, and my thread for sewing and binding was new raw silk.
It was late in the summer of 1470—the last of August, as I think—when I had the trial of my machine.
For greater privacy, we returned to Guaracco's country house, the scene of my first appearance in this age. Guaracco led the way on his fine white stallion; I rode the gray that had belonged to my hapless adversary Gido, which had later been given me by Lorenzo.
Lisa had a pretty little mule, and two grooms carried the unwieldy bundles that held my wings and rudder. How and when Guaracco's dwarfs made the journey, I do not know. We left them behind in Florence, but they were waiting for us when we dismounted at the country house. Servants like that pleased Guaracco immensely.
After a light noon repast of cold meat, bread, and some white wine, I went to a shed at the back of the house. Scrambling up, I donned my pinions.
They measured almost thirty feet from tip to tip and were fastened to me with light, strong straps, under the armpits, around my biceps and between elbow and wrist. There were springy grips for my hands, and by relaxing or applying squeeze-pressure I could spread or fold the umbrellalike ribs that supported the fabric. The tail was similarly fixed to my legs, which I could straddle to extend the fan or hold close to fold it.
I gazed down to the ground. It seemed a long way off. Beneath me stood Lisa, her face full of apprehensive interest; and at an upper rear window of the house Guaracco thrust his red-bearded head forth to watch.
"Ready," I said to myself. "Go!"
I sprang. As I did so, I spread and beat the wings, extended the tail downward to give me direction in soaring. A sickening, airy moment. My face turned up into the sunlight, I seemed to feel the world grow small beneath me. Another longer moment, with the touch of triumph, another beating thrash of the wings. Then I whirled helplessly—and fell.
I suppose I was stunned. There was a galvanizing shock and darkness, then, from far away, laughter— the delighted laughter of Guaracco. Blending with it came a second voice, softer, gentler. Lisa was pattering a prayer for my safety.