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Can anyone tell me what a ring marked S 11 5 with an upside down triangle and the letters TD on the inside of the triangle mean?
Brln2314
The S refers to sterling silver, and the 115 refers to the ring being 11.5% sterling. The triangle and TD are very likely a maker's mark.
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∙ 10y ago
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What are some uses of trigonometry in carpentry?
The Pythagorean Theorem: a^2+b^2=c^2, for checking squareness, a critical rule in carpentry. If two adjacent and perpendicular walls in a room are legs of a triangle, points a and b can be marked on each leg respectively and hypotenuse c measured with a tape measure (c) to confirm squareness or degree out of square. This can be used in many applications from framing to tiling. Most carpenters I've met use the 3-4-5 rule and don't even know what it's called!
How do you calculate sin inverse?
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A key that when locked down causes all letters tp capatalized?
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