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Isometric ellipse drafting template (Helix H82)
Object/Artifact
Rectangular translucent plastic drafting stencil with cut-out ellipses for drawing in isometric projection. Twenty-six bevelled-edge elliptical apertures are arranged in three registers, each labeled with its major-axis dimension in millimeters; the upper long edge carries a graduated ruler scale. Surface is discolored with amber-brown staining and scattered scuffs but structurally intact. Approx. 200 × 118–125 mm per manufacturer specification (not independently measured).
2025.16.5
Evelyn Sosa collection
2025.16
Evelyn Sosa
Gift
Helix
U.K.
Europe
Date: Undated. Cannot be confirmed within 1959–1990 and may fall outside it; the H82 model has remained in catalog for decades.
"HELIX H82 / Made in England" (lower right) "35° 16′ ISOMETRIC / ELLIPSE TEMPLATE" (lower center) "METRIC" (lower left, molded relief) Edge ruler graduated 0–190 mm Aperture size labels: upper row 50, 45, 40, 35, 32; middle row 15, 16, 18, 20, 22, 25, 28, 30; lower row 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2 (26 ellipses, 2–50 mm — matches manufacturer's published specification)
Materials: Molded translucent rigid plastic (specific polymer not confirmed from image; current production is described by the maker as polypropylene). Technique: Injection-molded; brand and "METRIC" rendered in molded relief, scale graduations and remaining lettering screen-printed in black; apertures die-cut/molded with bevelled inner edges.
Good
U.K.
Europe
production
Havana
Cuba
Caribbean
Central America
use