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OCR: slit sunlight slack thread on back of card liney sun slit With bead equal held spaces noon Point adjust taut thread through latitude slit to desired date point. bead thread 2130 1730 Jan Feb. 2330 Dec. Nov. 2330 Mar Oct Apr. Sept May plumb 30 June bob 1515 3'15 Julv Read down first-day each month points for Read line beaa eqva