It's a Snap! George Eastman's First Photograph by Monica Kulling, illustrated by Bill Slavin

From chapters.ca:
In 1877 in Rochester, New York, George Eastman couldn't understand why picture- taking was so difficult. Having left school at fourteen to support his mother and two sisters, George decided to find out by making photography his hobby. He packed up glass plates, a plate holder, a tent, a heavy tripod, a thick piece of black cloth, a water jug, and chemicals and set off to take his first photograph. George realized that not many people could own a camera - they were too expensive and the size of today's microwave ovens! But how could he make picture- taking easier? Eventually, George created dry plates, and they were such a success that he opened his own dry- plate company in 1881. But this was only the beginning - George went on to invent film and the Brownie camera. The rest is history.