Operation Under Unusual Conditions

Cold

(Below

Freezing)

B e extra careful handling the board. Cold makes the plastic material more brittle, and

therefore more easily cracked or broken.

Use a dry cloth for cleaning. A damp cloth will leave a film of ice.

Dusty or Sandy Conditions

When handling and cleaning the board, be extra careful not to scratch its plastic surfaces.

Scratching will destroy the transparencies of the base grid or disk surfaces. Scratching could

also wipe out the lines of the vernier and scale.

Shake dust and sand out of the carrying case.