A Manual of Telegraph Construction: the Mechanical Elements of Electric Telegraph Engineering
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In our eReader you can find the full English version of the book. Read A Manual of Telegraph Construction: the Mechanical Elements of Electric Telegraph Engineering Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Manual of Telegraph Construction: the Mechanical Elements of Electric Telegraph Engineering
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Scissors and shears for soft flexible materials have edges commonly 90°, seldom less than 60°; the blades should be curved and not straight; they may be loose when at right angles to each other, but should begin to cut near the joint, they should not be loose when they are sufficiently closed to cut, and they should leave the cut edges, exact. Shears for metal act somewhat differ- ently from scissors, they force the material asunder; their SCISSORS AND SHEARS — SHARPENING TOOLS. 291 edges are m...ore obtuse than those of scissors, and are seldom more acute than 80°; they commonly have straight blades. It is of primary importance that the edges of scissors and shears meet, as if they are separated the labour is enormously increased, the material is torn, it gets between the blades, becomes jammed, and with metal shears the bar or plate is tilted and the shears are strained, or perhaps broken. In working India-rubber or gutta- percha, bent scissors should be preferred; to cut India-rubber they should be used wet, but for gutta-percha they are only required to be wet when the material to be cut is soft.
What to read after A Manual of Telegraph Construction: the Mechanical Elements of Electric Telegraph Engineering?
You can find similar books in the "Read Also" column, or choose other free books by Douglas, John Christie to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Scissors and shears for soft flexible materials have edges commonly 90°, seldom less than 60°; the blades should be curved and not straight; they may be loose when at right angles to each other, but should begin to cut near the joint, they should not be loose when they are sufficiently closed to cut, and they should leave the cut edges, exact. Shears for metal act somewhat differ- ently from scissors, they force the material asunder; their SCISSORS AND SHEARS — SHARPENING TOOLS. 291 edges are m...ore obtuse than those of scissors, and are seldom more acute than 80°; they commonly have straight blades. It is of primary importance that the edges of scissors and shears meet, as if they are separated the labour is enormously increased, the material is torn, it gets between the blades, becomes jammed, and with metal shears the bar or plate is tilted and the shears are strained, or perhaps broken. In working India-rubber or gutta- percha, bent scissors should be preferred; to cut India-rubber they should be used wet, but for gutta-percha they are only required to be wet when the material to be cut is soft.
What to read after A Manual of Telegraph Construction: the Mechanical Elements of Electric Telegraph Engineering?
You can find similar books in the "Read Also" column, or choose other free books by Douglas, John Christie to read onlineMoreLess
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