BUNSEN PHOTOMETER

OBJECT:

How to construct a Bunsen Photometer.

MATERIALS:

PVC Pipe about 38 inches long, Attach a metric stip to the pipe, or easier; measure with a tape and then convert to metric, and record the Du and Sc, Leg support form the SBB, Plastic screen support ( see How to make a screen support ) Small light source a four watt night light, Candle, Small quantity of aluminum foil, 2 pieces of PVC pipe, measuring about 2 and 1/2 inch, to attache the light and candle, Square piece of white paper, Drop of oil ( use safe food oil ) Two additional PVC " T ", Rubber bands.

PROCEDURE:

1. SAFETY FIRST, Be sure to take every possible precaution to prevent INJURY and FIRE. SAFETY GOGGLES, when you strike a match, sometimes a piece of match will fly off in any direction. Fire is a possibility, be sure to have means to put a fire out, best thing is to have on hand, is a fire Extinguisher and a source of water! PVC plastic pipe can catch on fire, so keep flame well away from Plastic pipe. CAUTION: It is also important to wrap the 2 and 1/2 inch of PVC pipe, the one to which you will attach the candle to, with aluminum foil to prevent the PVC plastic from igniting. CAUTION: If a person has long hair, do not work over the candle area.

2. See above diagram! You will need a light source, probably also extension cord as well. When using electrical extension cords, be sure to place heavy books on the cords to prevent movement. A lighted candle will produce dripping wax, so be sure to use a sheet of aluminum foil in that area.

3. It should be pointed out, that to make a connection between PVC pipe and the "T" it may require as much as 3/4 of an inch of PVC, that is the reason for the 38 inches for the length of PVC pipe. The oil spot should be in direct line of sight between the candle and the light source. The plastic screen can be moved forward and backward and side ways as well and the spot can be move up and down.

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