Make spectrometer

A) Easy way: 
A-1. LP record or CD diffraction grating. Look at light reflected at
near glancing incidence on a LP record or CD.
A-2. Look light through a diffraction grating. Put it up close to
one eye. (Diffraction grating is attachments for LFHST teacher's kit)

B) Mailing tube spectrometer: Use a mailing tube about 2 ft long.
Mount diffraction grating on one end. Mount a single slit on the other
end. The slit is best made with two single ended razor blades. Tape
one blade. Stick the other on with nonhardening puffy, so that you can
adjust it narrower or wider.

                          Look at the spectra!

1. Sodium. Pour some salt (NaCl) on wet spoon. (I used miso soup
instead of salt because miso soup contains salt) Set the spoon in the
flame of gas stove in dark room. Look at the yellow flame through a
diffraction grating. The yellow light from sodium is a doublet of two
lines with wavelengths 5890 and 5896 A.

Question. Can you resolve the sodium doublet?  I can't resolve the
sodium doublet with my spectro meter. How about you?

2. Mercury vapor: Fluorescent lamps, mercury vapor street lights.

3. Neon. Neon lamps. I use a neon lamp that screws directly into
100 V AC socket. (In Japan we use 100 V AC at home) 

4. LED (Light Emitting Diode) Red, Green, Yellow.....

5. Fraunhofer lines in the spectrum of the sun. Maybe you have to use
mailing tube spectrometer. Go out side on the sunny day. Lay a piles
half a dozen of sheets of white paper on the ground.(It is as white as
possible) Look at the sunlit paper with your spectrometer. Use a coat
or blanket to cover your head to keep out stray light. Look for
several dark lines crossing the continuous spectrum of the sun. The
dark lines are Fraunhofer lines!

Question. What is Fraunhofer lines? What does Fraunhofer lines mean?

Reference book. 
Berkley physics course-volume 3. WAVES. by Frank S. Crawford, Jr.