Each group needs:

• 1 rectangular piece of thick foam core, 25.5 x 76 cm (10 x 30-inch) and 5 mm (3/16 inch) thick
• 2 Styrofoam cups
• 1 holographic diffraction grating (1,000 lines per mm or 25,400 grooves per inch)
• 1 ruler
• 1 meter stick
• 1 protractor
• 1 X-ACTO knife
• 1 black fine point permanent marker
• 1 incandescent flashlight with focusing beam (mini mag-lights are best; LED flashlights do not work)
• Engineering Your Own Spectrograph Worksheet

To share with the entire class:

• 1 roll of masking tape
• Red, green and violet markers
• Sheets of paper, from legal- to poster-sized, for calculations and sketching

Material note: Purchase holographic diffraction gratings in sheets or on card-mounted slides; prices from Rainbow Symphony Store (2007)

http://www.rainbowsymphony.com/:

• A set of 10 12-inch x 6-inch linear sheets with 1,000 lines per mm for $25
• A set of 50 2-inch x 2-inch linear calibrated card-mounted slides with 1,000 lines per mm for $20
• A set of 100 2-inch x 2-inch linear calibrated card-mounted slides with 500 lines per mm for $35