Turn and tilt easel

作者: Floyd D. Robins

DOI:

关键词: Engineering drawingBase (geometry)Turn (geometry)EngineeringTilt (camera)Geometry

摘要: A turn and tilt easel has a box base which parallel oppositely spaced sides bottom. The is attached to the formed of upwardly extending members are pivotally at one end midway along length base. with first second writing surfaces between on each side form side. above upper surface by an amount will permit rotate about pivotal attachment least fifteen degrees from vertical or normal In preferred embodiment, comprise chalkboard, while remaining dry-wipe board. handle may be top for ease in transportation location another. face can used storing material, such as "Magic Markers" board chalk chalkboard.

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Evans Clarence A, EDUCATIONAL OR SIMILAR DEVICE. ,(1900)