The astrolabe is an ancient astronomical tool of ... and whipped up a simple scroll saw powered by an old sewing machine foot treadle to speed up his work. The real treat though is the hand ...

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So what follows is very summary indeed. At first sight this astrolabe looks like an outsized old-fashioned pocket watch with an entirely brass face. It sits easily in my hand - in fact it fills it ...

The activity should take one-and-a-half class periods. It will take one period to make the astrolabe, which students can then take home at night to determine their latitude. The next day students ...

So what follows is very summary indeed. At first sight this astrolabe looks like an outsized old-fashioned pocket watch with an entirely brass face. It sits easily in my hand - in fact it fills it ...