The final subdivision map shall be clearly and legibly drawn upon tracing cloth of good quality. All lines, letters, figures, certifications, acknowledgments and signatures shall be made in black India ink. Typewriting or rubber stamps shall not be used. The map shall be so made and shall be in such a condition when filed, that good legible blueprints and negatives can be made therefrom. The size of the sheets of tracing cloth shall be eighteen by twenty-six inches leaving a margin of two inches at the left edge and one inch at the other three edges of the sheets. The scale of the final map shall be one inch equals one hundred feet. (Ord. 89 § 4.2(a), 1955).