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Abrasives: Baking soda, scouring powder, and pencil erasers all cause damage to coins. [12] Brushing a coin with a toothbrush or a brush with soft fibers can create minute scratches on the surface of a coin. [15] These scratches, known as "hairlines" may impact the grade of the coin depending on the severity. [14] Burnished/ Polishing
Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine)) Sandpaper, also known as glasspaper or as coated abrasive, is a type of material that consists of sheets of paper or cloth with an abrasive substance glued to one face. [1]
If the load is evenly split across the two directions, the current in each direction is half of the total, allowing the use of wire with half the current-carrying capacity. In practice, it is impossible to ensure the load does split evenly, so regulations require a thicker wire, of at least 2/3 the current capacity of the fuse or circuit breaker.
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