then the gardens of the Luxembourg there are now com- twisting or increasing the angle of the rollers until paratively few relics of its former grandeur, but they equal four grooves. The sane result may be among theseis the grotto of Marie de Medici, shown obtained with the axes of the rollers in… … eut screws. We are informed that from the window. It is now an exhibit at the National Industrial Art Museum at South 4,000 to 5,000. three-quarter inch coach screws, 4 inches long, can be made in a day’ Kensington, London. Its richness of @ect with one machine. The wear of the rollers is very…
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