. Canadian forest industries 1903. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN April, 1904 TRANSMISSION ROPE. The Consumers' Cordage Company, of Montreal, having received many enquiries from time to re- garding the relative efficiency ot three and four strand rope, give the following reasons for the position they take in always recommending three strand rope in pre- erence to four strand: Three strand rope is laid more closely, has no heart and the strands bear on each other evenly. On the contrary, there is a space lef
. Canadian forest industries 1903. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA LUMBERMAN April, 1904 TRANSMISSION ROPE. The Consumers' Cordage Company, of Montreal, having received many enquiries from time to re- garding the relative efficiency ot three and four strand rope, give the following reasons for the position they take in always recommending three strand rope in pre- erence to four strand: Three strand rope is laid more closely, has no heart and the strands bear on each other evenly. On the contrary, there is a space left in the centre of four strand rope, which is usually filled up by a heart. The rule in making rope to gel at the number of yarns put into the heart is that the heart should contain i/i3th of the total number of yarns in the strands composing the rope. Supposing a four strand rope contained 132 threads, the h< art would be equivalent in bulk to 10 threads, wh»l«" the strands would contain 33 threads apiece. It is readily seen how much inferior in strength the heart is to any single strand, and it is not surpris- ing that when a strain comes upon the rope that the heart is the first to break. Atte. the heart is parted a space is left ins:de of the rope, one of the strands cuts in, the rope is stranded and after a time goes to pieces. With a three strand rope this does not occur, for the strands bear evenly. Furthermore, the strength of four strand rope is much inferior to that of three strand. We give you be'ow tests ol three and four strand rope made by United States Government at the Watertovvn Arsenal. Comparative Tests, Pure Manila Rope. Cir. Size 3 Strand. 4 Strand. 2J/ inch 6206 lbs ^633 lbs. / " 9800 " 8583 " 4^ " 20873 " 18100 " The above is the average of three tests. There is no room for question but what three strand rope is stronger than four strand rope. Three strand rope is also much better adapted for transmission ot power b
Size: 2629px × 951px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
