The Construction Ofan Instrument For Measuring The Azimuth Of The Sun The Moon Or Any Star On The Horizon

JTYAVING fully examined all the properties of the lodestone and the phenomena connected therewith, let us now come to those instruments which depend for their operation on the knowledge of those facts. Take a rounded lodestone,1 and after determining its poles in the manner already mentioned, file its two sides so that it becomes elongated at its poles and occupies less space. The lodestone prepared in this wise is then enclosed within two capsules after the fashion of a mirror. Let these capsules be so joined together that they cannot be sepa-

1 A tcrrella, or earthkin.

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