**Chrystal**, Introduction to Algebra (1898); H.

**Chrystal**, TextBook of Algebra (pt.

Evelyn notes in his Diary a visit in 1673 to the Italian glass-house at Greenwich, " where glass was blown of finer metal than that of Murano," and a visit in 1677 to the duke of Buckingham's glass-works, where they made huge " vases of mettal as cleare, ponderous and thick as **chrystal**; also looking-glasses far larger and better than any that came from Venice."

Hence the density v is given by 47rabc (x2/a4+y2/b4-I-z2/c4), and the potential at the centre of the ellipsoid, and therefore its potential as a whole is given by the expression, adS Q dS V f r 47rabc r' (x2/a4-I-y2/b4+z2/c4) Accordingly the capacity C of the ellipsoid is given by the equation 1 I J dS C 47rabc Y (x 2 +y 2 + z2) V (x2/a4+y2/b4+z2/c4) (5) It has been shown by Professor **Chrystal** that the above integral may also be presented in the form,' foo C 2 J o J { (a2 + X) (b +X) (c 2 + X) } (6).

**Chrystal** in English; Serret's Cours d'algebre supe'rieure in French; and in German those of Stern, Schlomilch, Hatterdorff and Stolz.

Clerk Maxwell and George **Chrystal** that Ohm's law is true, within the limits of experimental error, even when the currents are so powerful as almost to fuse the conducting wire.