Stream Study Nets
You will need: 1 wire coathanger :: 1 pair of used pantyhose :: needle & thread
- Bend the coathanger into a circular shape.
- Bend the hook until it is closed to form a handle. Some instructions suggest adding additional handles, they can be awkward for students to work with and carry.
- Sew the waist of the pantyhose to the frame as neatly as possible - folding the elastic to the outside of the net. (You do not want to create a "lip" of elastic on the inside of the net, it will obstruct its operation.
- Cut the legs of the pantyhose and sew the openings shut. The body of the pantyhose will form the pouch for the net.
You will need: plastic container (yogurt, margarine, cottage cheese) :: clear plastic wrap or bag :: scissors, large size :: elastic bands
- Help students to cut off the bottom of the container.
- Stretch plastic wrap over the bottom. Fasten it into place using elastic bands.
To use: Plunge the magnifier straight down into the water being careful not to let any water in. (If water fills the container, the magnifier won't work.)
You will need: 20 cm diameter piece of 3mm galvanized tin :: black waterproof paint :: white waterproof paint :: drill :: 10 mm drill bit :: 10 mm eyebolt and nut :: tape measure :: 10 metres of polyethylene rope :: permanent marker
- Paint both sides of the piece of tin white.
- Locate the centre of the disc by drawing an X from 4 equidistant points around the perimeter of the tin.
- Paint 2 opposite quadrants of the X you marked black on both sides of the disc.
- Drill a 10 mm hole in the centre of the disc.
- Insert the eyebolt through the hole and thread the nut onto the eyebolt and tighten.
- Tie the rope onto the eyebolt and mark off .5 m increments on the rope with the permanent marker.