This section is from the book "The Engineer's And Mechanic's Encyclopaedia", by Luke Hebert. Also available from Amazon: Engineer's And Mechanic's Encyclopaedia.
An astronomical instrument, for exhibiting the motions of the heavenly bodies, was first constructed by Graham; but its name is derived from one made by Howley for the Earl of Orrery. It is now generally called Planetarium, (which see.)
 
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