A _______, invented by Stephen H. Horgan, changes continuous tones into dots of varying sizes. Squares are formed by horizontal and vertical rules etched on pieces of glass. The amount of light that passes through each square determines how big each dot should be.

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1. A _______, invented by Stephen H. Horgan, changes continuous tones into dots of varying sizes. Squares are formed by horizontal and vertical rules etched on pieces of glass. The amount of light that passes through each square determines how big each dot should be.