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The Compass |
| It was the discovery that lodestone could be used to magnetize small metal pins that
would always point north that led the development of the compass. That, in turn, led
to a means of navigating ships on the high seas. Dead Reckoning is a means of
determining position by knowing your starting point, what direction you are traveling and
the length of time traveled. Columbus used it to navigate his ships across the
Atlantic and discover America. |
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| Black Plastic |
Compass/Thermometer Key
Chain |
Quality Metal |
Black Plastic Compass
1.5" face, housed in a black snap-lid plastic case with loop for chain attachment
No. EP420-BK. Only $2.95
Compass/Thermometer Key Chain
Two dial type indicators float in liquid filled chambers - direction and temperature.
No. EP420-KC. Only $4.95
Quality Metal Compass
Protective lid and needled stop lever to lock in the direction reading and protect the
needle from bouncing during jarring activities. No. EP420-MT. Only $7.95 |
The Astrolabe |
| The compass requires that you know your starting point. The
Astrolabe doesn't.
Developed in the early 16th century, it is used to determine your position by the
stars. Used by the great explorers and even today it's very useful for astronomy,
surveying and map-making. |
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Astrolabe Kit
This fascinating 7" x 6" is used to measure angle of sight. Used
extensively in making real scientific measurements of declination, altitude and azimuth of
celestial bodies, to observe the in order to motion of the earth, and to measure,
slope, strike, dip, elevation of geological features.
No. EP420-AL. Only $12.95 |
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