Terrestrial and Celestial Globes Volume 1: Their History and Construction Including a Consideration of their Value as Aids in the Study of Geography and AstronomyStevenson, Edward Luther
History
Terrestrial and Celestial Globes Volume 1: Their History and Construction Including a Consideration of their Value as Aids in the Study of Geography and Astronomy
Stevenson, Edward Luther
Geography -- History; Globes
“This globe,” he says,[356] “which is a very large one, we have made
with great care, but with none the less than we have employed in all of
our others. The interior is of wood with many intersecting circles and
special supports, strengthened here and there from the center, and being
then fashioned into a spherical shape. As for its parts of wood, these
were made at Augsburg in the year 1570 before I returned to my native
land, as I found there a capable workman, having sought for a long time
elsewhere in vain for such an one. There, on account of its size, which
made it difficult to move, it had remained for five years, when I
returned to Augsburg; this was in the year 1575 as I came out of Italy
on my way to Ratisbon to be present at the coronation of the August
Emperor Rudolf II, when I found the globe had been finished some time
previously. But its shape (sphericity) did not altogether satisfy me,
moreover certain cracks could be seen. In the following year, and not
without much difficulty I had it carried to Denmark. There the cracks
were filled in and the sphericity made more nearly perfect by laying
over the surface about one hundred skins. There followed a testing for a
period of two years to ascertain whether the cracks would reappear after
two summers and two winters. When, after this test, I saw that it
retained its sphericity, I covered it over with thin brass plates of
uniform thickness without mishap, and this I did with such care and
skill that you would be led to say the globe was made of solid brass,
the joinings of the plates being scarcely visible. I next fashioned it
into a perfect sphere and marked thereon the zodiac, and the equator
with its poles, also the degrees each of sixty minutes by engraved lines
as we do in such work. I then left it for the space of one year, as
there was some doubt after putting on the brass plates as to whether the
globe would retain its sphericity in winter and in summer. When it had
been sufficiently tested not only did I indicate the circles of which I
have spoken but also all the stars of the eighth sphere I represented in
their proper places, as many stars as were to be seen in the heavens,
and I increased their number more and more in succeeding years up to
1600. Thus I with purpose added all the stars visible to the naked eye,
in their proper places adapted to the year 1600 which was near at hand.
And so there passed nearly twenty-five years from the first work on this
globe until it was finished, by the addition of its proper divisions and
its stars. This delay, although it might seem tedious, was not without
its value; for all things were thus done more carefully and better.
‘Work quickly only if you work well.’ Then the outer circles were fitted
to it, that is, a meridian and after that a horizon circle. This
meridian is made of brass, and each degree is divided into minutes, and
the horizon has the width of a palm of the hand, being covered with
Public-domain text, read in full here on John Shaqi.
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