The New John Gill Exposition of the Entire Bible1 Kings 7:15
For he cast two pillars of brass, eighteen cubits high
In (2 Chronicles 3:15) they are said to be thirty five cubits
high, which must be understood of the length or height of them both;
and whereas that would allow but seventeen cubits and a half to a
pillar, either the round number of eighteen is used, or half a cubit
in each may be allowed, either for the base or pedestal into which
they were put; or the chapiter at the top of them, into which they
might go such a length, and so only what was seen is described:
and a line of twelve cubits did compass either of them about;
the circumference of them, and therefore their diameter must be four
cubits. Eupolemus, an Heathen writer F14 speaks of these pillars, but
he makes the circuit of them to be but ten cubits; and says they were
equal in height with the temple, and stood on the right and left, and
were made of brass, and covered with gold, the thickness of a finger.
F14 Apud Euseb, Praepar. Evangel. l. 9. c. 34. p. 450.