Basic Idea:

• Examine the spectrum of Hydrogen, and measure the wavelength of each visible line. These directions are for the old spectroscopes, and still need to be modified!

What:	How Many:	Where:
1.0 mW He-Ne lasers (Red)	1	Ask faculty member for location
Hydrogen tube	1	non-Majors storeroom, shelf PP3
Hydrogen tube power supply What are these called?	1	non-Majors storeroom, shelf PP4
Black Variac	1	Majors storeroom, shelf E3
Spectroscopes	1	Majors storeroom, shelf P2 & P3
Diffraction grating (glass) (15000 or 25000 lines/inch)	1	Majors storeroom, in maroon "Central Scientific Co" box, on top of optics cabinet between shelves T3 and U3
2m Metersticks	2	non-Majors storeroom, shelf AA1
30m Tape measure (shared)	2	non-Majors storeroom, shelf AA5
Hooded desk lamp with low wattage (10W) bulb (to read vernier in dark)	1	non-Majors storeroom, shelf M4
Small plane mirror	1	non-Majors storeroom, shelf KK4
Cornell Slide block	1	non-Majors storeroom, shelf KK2
Mirror stand (in box with black mirrors)	1	non-Majors storeroom, shelf KK4
Wooden Drafting board	3	non-Majors storeroom, shelf J2

Computers Needed?

• No.

• Place the H-tubes on two wooden drafting boards; elevates to proper height for examination with spectroscope.

• Setup location:

  

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• The spectroscope:

  Top View	Back View

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• The diffraction grating faces the observer: