Vertical tambours

These can open from the top (falling, 249:5) or at the bottom (rising, 249:6) and require careful planning for there are certain pitfalls in this type as distinct from the horizontal form. If the vertical opening is tall (249:1) then a falling tambour could rattle down under its own weight immediately the lock is released, and if the carcass is shallow in depth it could partially return from the fully opened position if most of the weight is transferred to the back. On the other hand, a rising tambour requires more physical strength to lift it from a low position, and if very tall could either rattle down at the back as it opens, or down at the front as it is closed. This is assuming a sweet, free-running tambour (as it should be), and methods of restraining the unwanted movement, which can be pronounced in long tambours of heavy wood, include coil springs recessed into the carcass sides, with the locking rail attached to nylon cords; lazy-tong springs housed at the back of the carcass to absorb the downward movement, and felt restraining pads recessed into the sides of the grooves which grip the tongues of the slats and slow down the movement. These are compromises, however, and it is usually better to avoid large and heavy tambours or to split them into two wherever possible. These objections do not apply to wide but shallow tambours fitted to roll-top desks, or small vertical tambours in writing-cabinets and wall cabinetry.

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