I need to make a time measuring device. HELP!?

Question

Some instructions or a link to an online guide on how to build one would help a lot (the device should work for small periods of time, e.g. seconds).

Answer 1

An hourglass comes to mind.

You will need:

Two small clear plastic bottles with caps
Sand or table salt
Package tape
A nail
A clock
To make your hourglass:
1. Fill one of the bottles with sand.
2. Use the nail to make a small hole in each bottle cap.
3. Screw the caps on the bottle with sand and the empty bottle.
4. Place the empty bottle on top of the bottle with sand. The empty bottle should be upside down so the caps of both bottles are touching. Tape both bottles tightly together so they are joined at the caps.
5. Turn the bottles over so the bottle with the sand is on top. Look at your clock. How long does it take for all the sand to move from the top bottle to the bottom bottle?

Answer 2

Water clocks were one of the first time measuring devices constructed. They're basically a cup with a small hole in the bottom. The hole allows only drops of water to come out, which are collected in another container. Measurements on the container show the passing of minutes, or hours depending on the size and rate of flow. See the resource for detailed instructions for how to construct a basic water clock.

Answer 3

during the daylight - place a stick / rod vertically in the ground, what protrudes up is a sun dial

Answer 4

It's called a clock, dumbass.