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Of the extensive and scientific Geodesical Operations
described in these latter works, the present Treatise pro-
fesses to give nothing beyond a brief outline, as their
detailed account would be far too voluminous to be con-
densed in so small a compass.

The cadets at Woolwich and Addiscombe are taught the
use of the Chain and Theodolite; and to calculate the
contents of the different portions into which the ground is
divided by natural and artificial boundaries; they are also
rendered conversant with Plane Trigonometry and Mensu-
ration, and with sufficient Spherical Trigonometry for the
solution of the ordinary cases of Spherical Triangles.
Such preliminary knowledge is consequently assumed as
being already acquired. It is, however, in the power of any
individual to make himself master of the necessary theore-
tical part of this knowledge, by the study of one or other of
the numerous excellent works on Trigonometry and Mensura-
tion; and the practice of Land Surveying can be acquired in
a few weeks in the Field, under any competent Instructor,
or even without this assistance, by the careful study of some
elementary work on the subject.

Royal Engineer Establishment, Chatham.

1839.

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GEODESICAL OPERATIONS CONNECTED WITH A TRIGONOMETRICAL SUR-

VEY-Figure of the Earth-Measurement of an Arc of the Meridian-
Standards of Weight and Measure obtained from the Measurement of
an Arc of the Meridian between Dunkirk and Barcelona, detailed in
the "Base du Système Métrique Décimal”-Popular Account of the

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