This 1:87 scale brass model depicts a 1950s vintage Manitowoc 4600 Dragline. Details include 140 ft. of scale No. 27 boom, a fully detailed operator's cab, individually linked, free-rolling tracks ...

All spiders produce protein-based biopolymer fibres that we call silk. The most studied of these silks is spider dragline silk, which is very tough and relatively abundant compared with other types of ...