A history of electricity : the intellectual rise in electricity from antiquity to the days of Benjamin Franklin (1898)
Benjamin, Park, 1849-1922 · New York : J. Wiley & Sons · leaf 186
glass. In the centre of the instrument, andstepped in the glass cover and in the bottom of the box, isa pivot, through which passes the compass needle, now nolonger an ovoid lodestone, but a true needle of steel or iron.Then, at right angles to this needle is another needle,which, curiously enough,… … PEREGRINUS PIVOTED COMPASS.^ in the usual way, so that it will point north and south ;and then the azimuth bar is to be turned on its centre soas to be directed toward the sun or heavenly bodies, and inthis way, of course, the azimuth is easily measured. Infact, the device is the azimuth compass of…
Electricity · Magnetism
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