Publications for 03/1872

• Telegraph Extensions in Oregon, screw glass insulators used
• [ad] Want ad by Hemingray looking for broken glass
• James L. Foley
• Hemingray Glass Company, Covington, Kentucky
• Hemingray Glass Company, Covington, Kentucky
• [ad] Want ad by Hemingray looking for broken glass
• Telegraph Wire and Insulators by Charles Chester
• Letter from L.G. Tillotson on English telegraphs