s _Catalogue and Description of the Rarities belonging to the Royal
Society and preserved at Gresham College_ (London, 1681, p. 364) is
mentioned a Terrella contrived by Sir Christopher Wren, with one half
immersed in the centre of a plane horizontal table, so as to be like a
Globe with the poles in the horizon, having thirty-two magnet needles
mounted in the margin of the table to show "the different respect of the
_Needle_ to the several _Points_ of the _Loadstone_."

In Sir John Pettus's _Fleta Minor_, London, 1683, in the _Dictionary of
Metallick Words_ at the end, under the word _Loadstone_ occurs the
following passage:

"Another piece of Curiosity I saw in the Hands of Sir _William Persal_
(since Deceased also) _viz._, a _Terrella_ or _Load-stone_, of little more
than _6 Inches Diameter_, turned into a _Globular Form_, and all the
_Imaginery Lines_ of our _Terrestrial Globe_, exactly drawn upon it: _viz._
the _Artick _ and _Antartick Circles_, the _two Tropicks_, the _two
Colures_, the _Zodiack_ and _Meridian_; and these _Lines_, and the several
_Countryes_, artificially _Painted_ on it, and all of them with their true
_Distances_, from the two _Polar Points_, and to find the truth of those
_Points_, he took two _little pieces_ of a _Needle_, each of about _half_
{24} _an Inch in length_, and those he laid on the _Meridian line_, and
then with _Brass Compasses_, moved one of them towards the _Artick_, which
as it was moved, still raised it self at one end higher and higher, keeping
the other end fixt to the _Terrella_; and when it had compleated it Journy
to the very _Artick Points_, it stood upright upon that _Point_; then he
moved the other piece of _Needle_ to the _Antartick Point_, which had its
_Elevations_ like the other, and when it came to the _Point_, it fixt it
self upon that _Point_, and stood _upright_, and then taking the _Terrella_
in my Hand, I could perfectly see that the two _pieces_ of _Needles_ stood
so exactly one against the other, as if it had been one intire _long
Needle_ put through the _Terrella_, which made me give credit to those who
held, That there is an _Astral Influence_ that _darts_ it self through the
_Globe_ of _Earth_ from _North_ to _South_ (and is as the _Axel-Tree_ to
the _Wheel_, and so called the _Axis_ of the _World_) about which the
_Globe_ of the _Earth_ is turned, by an _Astral Power_, so as what I
thought _imaginary_, by this _Demonstration_, I found _real_."

[63] PAG