Fraction Adding Machine

Adding Machine in case Adding machine Materials Fasteners Rough cut-out Thin corrugated -- from cereal box Glue stick Gluesticking... Glued to board Cut out forms Cut fine details Outline Cut lower layer cut out Pushpin 0 Pushpin 1 Pushpin 2 Pushpin 3 Complete lower disk Basic stack Add brass fastener Cheerful, aren't they? EMSL Adding Machine Initial condition Usage 1: Insert pen Usage 2: Clockwise to zero Usage 2a: Zeroed Usage 3: First operand Usage 4: Enter first operand Usage 5: Second operand Usage 6: clockwise to stop & read out Minimal Design Minimal version-2 Full stack of three. Back of optional base Tape down fastener, back side Glue fastener, front side more glue Completed (w/ optional base) Begin (optional base) Initialize (optional base) Initialized (optional base) First operand (optional base) First operand entered (optional base) Second Operand (optional base) Answer with carry (optional base) Answer with carry 2 (optional base)