operation of getting a nice point on the instrument in question ; to prevent this and the spoiling of pen knives this invention was made. It consists of a sin gle piece of sheet steel cut out blank from the mate rial ; the two sides of each end are then doubled over so that the edges form an oblique angle with the A STEEL suspension bridge of one hundred yards span is now undergoing the scientific test at Birk enhead England. The steel used in its construction stood the handsome test of seventy tuns per square inch of tensile strain., scientific american, 1862-11-08
operation of getting a nice point on the instrument in question ; to prevent this and the spoiling of pen knives this invention was made. It consists of a sin gle piece of sheet steel cut out blank from the mate rial ; the two sides of each end are then doubled over so that the edges form an oblique angle with the A STEEL suspension bridge of one hundred yards span is now undergoing the scientific test at Birk enhead England. The steel used in its construction stood the handsome test of seventy tuns per square inch of tensile strain., scientific american, 1862-11-08
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