31 iron filings in glycerin E-90 Soft iron bars extend the poles of a permanent magnet into a projection cell with iron filings in a equal mixture of glycerin and alcohol.
(31 iron filings in glycerin E-90 Soft iron bars; extend; the poles of a permanent magnet; into a projection cell with iron filings in a equal mixture of glycerin and alcohol)
31 iron filings in glycerin E-90 Soft iron bars
extend
the poles of a permanent magnet into a projection cell with iron filings in a equal mixture of glycerin and alcohol