The Mother Earth News
(Page 2 of 2)
January/February 1977
By the Mother Earth News editors
To measure relative humidity, obtain two identical thermometers and completely wrap the bulb on one with a small square of wet muslin. Tie the soaked fabric on with thread and place both thermometers in the breeze from a fan. Check the instruments after one to two minutes, note the reading of each (the wet-bulb thermometer will register somewhat lower than the dry) and compute the relative humidity on the chart below.
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HOW TO
DETERMINE
RELATIVE
HUMIDITY
Here's another old-limey toy that will help keep the young' uns occupied while you finish the chores.
The hardest item to find these days while gathering materials for your racer is a large wooden spool . . . plastic just doesn't make it! You'll also need a 1/4-inch dowel three inches long, a large bead (bigger than the spool's hotel, a strong 4-inch rubber band and two small nails.
Turn the spool on end and drive the two nails into the wood on opposite sides of the spool's hole . . . leaving enough of each nail exposed to hold the rubber band. Wrap the band around the nails, thread it through the spool and bead, and slip the dowel through the protruding loop. Now you're ready to race.
Wind the rubber-band motor, place the toy on a smooth surface and watch it go!
Sometimes the simple, "primitive" ways can be very good ways indeed. The Indians of Colombia, for instance, use a baby carrier—called a ruana—that's nothing but a coarsely woven rectangle of cloth slit halfway up the center. The carrier holds a child comfortably and securely yet leaves its mother's hands free . . . without the aid of a single safety pin, button, or snap!
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