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A form of bench dog, a traditional holdfast has either a curved or flat top. Its shank is slid loosely into a “dog” hole in the bench until the tip of its hook touches the work. It is set by hitting its top with a mallet or hammer, which causes the shaft to wedge tightly against the sides of the hole. A tap of its back side near the top ...
The table top consists of two wooden jaws, one of which is fixed and the other moveable on threaded rods operated by handles. It can be used as a bench vice to hold wood, metal and other parts, either clamped between the jaws or, using supplied bench dogs, clamped on the table top.
Typical sizes for desk pads are A3 (420 × 297 mm, 11.7 × 16.5 in) and A2 (594 × 420 mm, 16.5 × 23.4 in). Desk pads are very popular promotional products, usually branded with a logo, contact information and product or service information. Desk pads are typically glued at the foot (bottom) of the pad to prevent the paper from curling.
Unlike the cylinder desk, the rolltop desk could be mass-produced rather easily since the simple wooden slats could be turned out very fast in a uniform way. In contrast, the wooden section of a cylinder had to be treated with great pains to keep its form perfectly over time, lest it warp or bend, and make it impossible to retract or extend.
Pockets, typically rimmed at the back with leather or plastic traditionally have drop pockets, which are small receptacles below each pocket to contain the balls. More modern tables may instead employ ball return pockets , a series of gutters inside the table, which deliver the balls into a collection compartment on one side of the table, in a ...
Naturally occurring tungsten consists of four stable isotopes (182 W, 183 W, 184 W, and 186 W) and one very long-lived radioisotope, 180 W. Theoretically, all five can decay into isotopes of element 72 by alpha emission, but only 180 W has been observed to do so, with a half-life of (1.8 ± 0.2) × 10 18 years; [36] [37] on average, this yields ...
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