. Bulletin. Agriculture. Fig. 1.—The upper cage incloses section of regular commercial cable and two suspen- sion rings. The lower cage incloses section of dead cable used as a check. Insert, view showing repair of telephone cable made necessary by an attack of the lead-cable borer. Photograph by H. E. Burke and insert by R. D. Hartman. Fig. 2.—Test cables inside of cage, suspended by various types of rings. Some have direct current of electricity and some are without current; some were treated with various repellents and some were normal. Photo- graph by H. E. Fig. made. -Cables o
. Bulletin. Agriculture. Fig. 1.—The upper cage incloses section of regular commercial cable and two suspen- sion rings. The lower cage incloses section of dead cable used as a check. Insert, view showing repair of telephone cable made necessary by an attack of the lead-cable borer. Photograph by H. E. Burke and insert by R. D. Hartman. Fig. 2.—Test cables inside of cage, suspended by various types of rings. Some have direct current of electricity and some are without current; some were treated with various repellents and some were normal. Photo- graph by H. E. Fig. made. -Cables on which cable tests were Photograph by H. E. Burke. Fig. 4.—Section of cable and small cages built around it. These inclosed a section of the messenger strand, several suspension rings, and a section of the cable. Beetles were introduced into the cages to see if they would enter the cable. Photograph by H. E. Burke. THE LEAD-CABLE Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. Washington : Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
