One of Orville’s early money-making ventures was the collecting of old bones in near-by alleys, vacant lots, or neighbors’ yards, and selling them to a fertilizer factory. He and another boy first did this as a means for raising funds with which to buy candy for use while fishing. They accumulated a weight of bones that it seemed to them must represent a small fortune--and were somewhat shocked when the buyer paid them only three cents. At first, Orville’s associates in his projects were boys of his own age rather than Wilbur, who was more than four years older and moved in a different group; but a day came when the brothers began to share curiosity over a mechanical phenomenon. In June, 1878, when Orville was seven years old and Wilbur eleven, the Wright family left Dayton, because the work of the father, who had been made a Bishop of the United Brethren church, was shifted to Cedar Rapids, Iowa. And it was in a house on Adams Street, in Cedar Rapids, not long after their arrival there, that an event occurred which was to have much influence on the lives of Wilbur and Orville--as well as to have its effect on the whole human race. Bishop Wright had returned from a short trip on church business bringing with him a little present for his two younger sons. “Look here, boys,” he said to Wilbur and Orville, holding out his hands with something hidden between them. Then he tossed the gift toward them. But instead of falling at once to the floor or into their hands, as they expected, it went to the ceiling where it fluttered briefly before it fell. It was a flying-machine, a helicopter, the invention of a Frenchman, Alphonse Pénaud. Made of cork, bamboo, and thin paper, the device weighed so little that twisted rubber bands provided all the power needed to send it aloft for a few seconds. As the brothers were to learn later, Pénaud, an invalid during most of his short life, had not only invented, as early as 1871, various kinds of toy flying-machines--both the helicopter type and others that flew horizontally--but was the originator of the use of rubber bands for motive power. Simple as was this helicopter--they called it the “bat”--Wilbur and Orville felt great admiration for its ingenuity. Though it soon went the way of all fragile toys, the impression it left on their minds never faded. Not long afterward Wilbur tried to build an improvement on that toy helicopter. If so small a device could fly, why not make a bigger one that could fly longer and higher? Orville was still too young to contribute much to the actual building of larger models, but he was keenly interested as Wilbur made several, each larger than the one preceding. To the brothers’ astonishment, they discovered, that the bigger the machine, the less it would fly; and if it was much bigger than the original toy, it wouldn’t fly at all. They did not yet understand that a machine of only twice the linear dimensions of another would require eight times the power.