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One problem with the light strings is that the students can't see the
innards as well as with a #14 bulb. I use the Radio Shack sockets because
they have openings which allow the students to see all of the connections.
If you use the Workshop physics labs, it is wise to try to match the
drawings as closely as possible. The other difficulty is that you can not
easily unscrew the bulbs as per some instructions.
If a bulb blows out, it has a shorting device which can confuse students.
While cost is a consideration, the pennies saved do not pay for
Pasco low friction carts,
motion detectors ...