- 11th and 13th
century "reading stones" were invented.
These were
primitive plano-convex
lenses initially made by
cutting a gl****
sphere in half. The medieval...
-
whereas Buffon's
version was
biconvex and in one piece, Fresnel's was
plano-convex and made of
multiple prisms for
easier construction. With an official...
- s**** is 30 mm, its
diameter 33 mm. The solid,
umbilicate s**** has a
conical shape with an
acutely angled periphery. It is dark
purplish or brownish-purple...
-
Hedgcoxe Road in
Plano.
Widening slightly as it
flows south and
crosses Legacy Drive, the cr****
continues a
southerly course through Plano between Preston...
- A
roundhouse is a type of
house with a
circular plan,
usually with a
conical roof. In the
later part of the 20th century,
modern designs of roundhouse...
-
Miamisburg Mound is a
conical Native American Mound in Miamisburg, Ohio. At 65 feet (20 m) tall and 800 feet (240 m) in cir****ference, it is the largest...
-
containing many
prehistoric artifacts,
north of the
conical mound.
After the excavation, the
conical mound was
reconstructed and
currently stands just north...
-
artefact made of thin gold leaf. It
served as the
external covering on a long
conical brimmed headdress,
probably of an
organic material. It is now in the Neues...
- of the s****
varies between 12 mm and 18 mm. The
umbilicate s**** has a
conical shape. It is dull grayish,
olivaceous or pinkish,
longitudinally lineolate...
-
objects are made of thin
sheet gold and were
attached externally to long
conical and
brimmed headdresses which were
probably made of some
organic material...
