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Thomas Mcdonald
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Publication of GB190628288ApublicationCriticalpatent/GB190628288A/en
Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
28,288. McDonald, T. Dec. 12. Pens, reservoir. To protect the nib when the pen is not in use, the stem a is provided with a screw-threaded sleeve c which, when screwed outwards, projects beyond the nib. According to the Provisional Specification, a slot and pin or equivalent connexion may also be used.