Modern carpentry and joinery : being a compilation of the very best things and most modern and practical methods known in the arts of carpentry and joinery (1910)
Hodgson, Frederick Thomas, 1836- · Chicago : F. J. Drake & Co. · leaf 201
el is usuallymade of tinned iron plate, and encases a stout spiralspring wound around an iron mandrel with squaredends to which a key is fitted for winding the springup. The ends of the mandrel project from the caseand are fixed in bracket plates at each end of theshutter—in the case of shop… … F Friction roUer Fig. 84. PRACTICAL SOLUTIONS 199 above, and the normal condition of things is that whenthe shutter is coiled up the spring is unwound. Thepulling down of the shutter winds up the spring, andthe tension is so arranged that it does not quite over-come the weight of the shutter and…
Carpentry
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