- hyper-radial lens in 1887 in the UK.
These lenses were
originally named biform, and
later triform and
quadriform lenses, by Wigham.
Thomas Stevenson used...
-
rebuilt tower with a double-height
lantern storey,
designed to
contain a '
biform'
optical system designed and
built by
Chance Brothers (consisting of two...
-
Curious and
Interesting Geometry,
Penguin Books, ISBN 9780140118131. The
Cundy Deltahedra or
Biform Deltahedra Weisstein, Eric W., "Deltahedron", MathWorld...
- forfeit, forum, reforest,
reforestation fōrma fōrm- form,
shape biform,
biformity, conform, conformable, conformance, conformant, conformity, counterreformation...
- (92 ft) Lens
Rotating three-panel 375mm
catadioptric optic (original),
biform tideland ML300
lanterns (current)
Intensity 3,976
candela Range 12 nmi (22 km)...
- 14 ft (4.3 m) wide; the
lantern was
painted red. It
contained a six-sided
biform (i.e. two-tier)
rotating optic of the first-order, 12 ft 6 in (3.81 m) high...
-
Gleerups förlag. p. 1175. Värnamo, fsv. bl. a. Värnamo 1237; av värn (med en
biform värn = isl. yprn) o. mö;
syftande på en mö med
skansar el. förhuggningar...
-
converted into a
bunsen gas for
heating a mantle.
Since that time a new
biform ML300
synchronised bifilament 20-watt
electric lamp has been used. Scotland...
-
light was
decommissioned the lens
array (a
rotating fourth-order 250 mm
biform optic)
flashed twice every ten seconds. The
light was
first lit on 19 April...
-
November 1887 and has a
focal plane of 180 feet. It
originally had an
enormous biform hyperradial optic 4.6
metres (15 ft) high and
weighing more than 8 tons...
