Parallel Lines Small 320×90 Medium 640×180 Large 1024×288 Download Tiff Original 2400×675 | (76.8 KB) Description Parallel lines Keywords line, parallel lines Galleries Lines Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 110 Courtesy the private collection of Roy Winkelman
