is page an engraving of a novel parallel ruler A novel and very simple device for securing traces to is scarcely at all affected by acids, cheap oils can be used. A great advantage is that no mould is required in which tc cast It is intended for all of the purposes for which parallel rulers it. The… … Mr. William Vogan, of Newcastle, Pa., has an improved E, may be adjusted at any required distance from the pin in gate, which may be opened and closed by the wheels of a pass- the groove. This distance governs the space between the lines SMITH’S WHIFFLETREE HOOK. ing vehicle, and is not liable to…
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