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Thomas Jackson
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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
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Footwear And Its Accessory, Manufacturing Method And Apparatuses
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Abstract
18,688. Jackson, T. Aug. 31. Mathematical drawing-instruments. - A pair of spring bow compasses is added to "interchangeable" school sets comprising a loose divider, a pen, and a solid lead holder, adapted to fit into the same pen or pencil handle and compasses, so as to provide spring bow pen or pencil compasses or dividers by the addition of a single instrument. The shank of the pen used is provided with a line or ridge coinciding with the split of the pencil holder of the ordinary or spring bow compasses, to facilitate the adjustment of the pen point.
GB190318688D1903-08-311903-08-31Improvements in Drawing Instruments.
ExpiredGB190318688A
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