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Scientific American, Vol. 18, No. 22 (1868) (1868)

leaf 3

An illustration from Scientific American, Vol. 18, No. 22 (1868), 1868, leaf 3
TY OF FIRST CLASS WORKMEN. consists of asingle pair. The operation of making a tire thumb nut. The bolt with which the nut engages is not the The abolishment of the system of apprenticeship in this pivot upon which the swinging steel frame turns; its object country, and the introduction of planers,… … chinery, when a general lack of resources and recipes published, but we think the following expedients will most probably manifest itself. to be the best that can be used: White chalk We know of one engineer who could only find at the third larged by rolling, and its section formed in the same…

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