around with them. It was found meter. This is due to the periodic change of focus the bottom. The observatory is shown in Pig. 2, the simpler, and almost as satisfactory, to transmit the previously referred to, which trouble I hope to obviate. mouth of the pit being visible just inside the door.… … so much importance. It can be seen of 15 feet. As the speed increases, Fig. 2.- Observatory, showing: arrangement of basin Fig, 8.—The revolving to good advantage without any eye- the focus shortens very rapidly, drop- and motor. reflector. piece, by merely looking down into the ping to about three…
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