The daily union. [volume] (Washington [D.C.]) 1845-1857, 1853-09-27

same edition as they furnish US subscribers for sra.
uss in the exposed positions generally occupied BY light
houses The different paris being cast, they are ground
10 the proper size BY machinery This process s very
dhcu requiring The greatest care. no, only 10 preserve
the optical properties Of the surface but TO prevent the
transparency OF the ass being affected BY scratches
Lastly comes the adjustment OF the different parts in their
respective forms, and the union OF the whole 10
produce tho desired cdec The different parts Of each
lens united by bronze frame, and whee the glass
edges in contact, by fine layer Il cement. The
very acute and delicate edges render lhs operation haz-
srdous one they are liable 10 be spnteed in the hands
There four different orders OF these instruments
ranging in size according to the position they have
order is suhdlvded into "hxed" revolving or flashing"
and "hxed, varied by flashes" The nsshing lights
he vared by the duration the fash and eclipse and in
some colored flashes have been employed for the
sake OF distinction. sae
The apparatus on exhibition is Of the lst order.
and is aresolvng or flashing light apparel ca'sdi-
oprqne de Isl ordre eciipses (a eclats sur 0ule
Ia hauienr) constructed By MI Henri Lepauie, No PAT
Rue ST. HonSIe Paris.
Il composed Of moveable frame, the central part of
WHICH is night hollow prism OF twenty. sides
Each OF these sides s formed Of panel, which 10 sec
ton Of an annuIar piano convex lens, four fee! three
inches in height, (he diameter OF the lens) and nine
inches wide these lenses constructed described
above, in separate pieceshe central disc being eleven
inches in diameter, and the annular rings which sur
round gradually decrease breadth they Icccde from
their axs-tbeir exterior convex surface being SER
rated thus reducing ihe thickness OF the glass while the
OF the lens preserved he pieces
are nniet together by fine layers OF cement. and tho
whole are firmly cemented into brass frame All the
light from The lamp in the common focus falling on
these lenses. reaced through tbem and thrown out
ia horizontal beam whose axis IL coincident with the
axis OF The lens There are, Therefore. tweny-iour
beams projected al the same time from the apparatus
when illlmiBaed and the revolution causes success
SION OF brilliant flashes which gives the character 10 the
light
These lenses are larger than any previously made be.
ing, stated above fifty iDcteswhereas the usual
height Of those hitherto constructed has been about forty
inches. There is limit however, 10 the s'xe cf the
lens, dependent The incident ray its edges which
must no, fall on il al TOO small angle In consequence
OF this limit TO the size Of the lenses considerable
perllon OF The light passes above and below them, 10
peven. lis loss, and to these rays 10 contribute
their share 10 the flash es, the apparatus on exhiboh
has below the lenses Of four, and above dome
of eleven. catadioplric rings OF glass
1hese rings placed in ~ frames corresponding with
the panels OF The central part, and triangular Psns
constced and adiasei in their frames that all The
rays lf light mIsgins them after bcing reraced
al he rst surface, reflected IRON the second and again
reftacted from the lhd--projectrd in horizontal beams
v s axes are parallel with the axis OF the central lens
in the section OF The frame-thus forming
beam Of light IRON the Top 10 the bottom OF the
feel 10 inches in height and over inches in width at
The centre
Owing 10 the lieht The common focns not being
mathematical point lhe rays enerslng from the lenses
have divergence which calculated at little five
degrees and the 81 pantl each occupy Is degrees,
there viii be muaneoasy projected from The apparatus
"a beams oil light covering each space o degrees, and
- Intermediate spaces without iiehi, each 10 degrees
H. therefore, The apparatus made 10 revol7e ia given
time. the ratio OF ihe flashes TO the eehpss will be
one TO twoif the revolution is made in twelve mnu,e
each panel occupying I5 degrees will be the 24h Of IL
minutes, or 80 seconds in passing the ESQ., and The nash
covering degrees will have duration o 10 seconds
the intervening eclipse being 20 seconds. s yreG
The g Il is produced by single lamp placed IN the
common focus. II IS cacel lamp, with burner ol
concenc wcks, the largest being nearly four inches in
dame err These wicks are kept constantly saturated
with oil. which is pumped up iroa reservoir below.
ia preventing undue car abonzaon and producing the
maximum brlllianey. The Supplying PumPs are moved
4 ~Ir~t-v
reservoir and burner, ats upon auPod resting on the
stationary part OF the apparatus, and BY means OF set
screws can be very nicely adjusted in the focal plane
cast iron column, or pedestal, snsaiDs the whole
structure, and has II shoulder with bed plate Of
siee with beautiful arrangement Of friction wheels
and rollers by which the moveahe frame. work is sup
ported and enabled 10 evoIve Motion is given TO this
by handsome piece OF clock-work. The whole
chney. and all the iron and brass work. are very con-
pete, and well worthy OF inspection. s..Sl.s
The FIRST apparatus OF THE kind imported mo this
try was ~ the is and one OF the ode, erected At
ment Srce $780, the burcas OF typographical engaeers
having chafse OF certain light houses, placed OF the
81 order in the lighthouse Brand, vine shos Della
ware Bay-onc vi the 81 order the Waugoochancs
light Lake Michigan and OF the Is, order sand
Key, Gulf of Florida This is the third apparatus O! the
s' order or largest sze imported into this country, and
ordered BY The lighthouse board for Cape Haeras.
where the dangers OF navigation require hat efforts
lor expense saouls be spared 10 have the best light.
The power OF the light exhibited is not accurately
known The Illuminating effect OF Ffesneis great lens
has generally been taken al 3 600 agand burners-ihe
value OF the hame s focss being about l6-ihusgiv-
iDg the increasing power OF the lens is0 These lenses
with the uprer aud lover rngs OF hIs appaa US, WILL OF
course, produce mach greater effect
The consumption Of oil IN the lamp ~ about 600 gallons
per annun Comparing the amount OF light with ihs
quantity of oil consumed revolving lights the dop
c or refracilng pnncige oil economically than
those in lie ca,op'rc, or rejecting pao, IN the ratio OF
l3 10 !.
The power OF these lights Is also great consideration
in their iavorenablng them 10 penetrate logs and be
visible times when feeble Ugh, would be lost They
be far the curvature OF the earth will ad
nit; and a is known where the elevation OF the
Iigh The OF France ani OF the observer the
Eng 81 shore such TO make the French light dis
tnguished al the distance oi fifty miles They almost
entirely employed in France and on the continent OF Eu-
rope. and gradually being pu ny England the great
Sherryvofe light house having
IL is believed TO be the wish OF the lighthouse board 10
Introduce Them into all hTsclsss or s,aooss lights
and s therefore, of grea, Importance that all pereons
interested in and navigation should vs't and IN
spet the appsa'us, and their infssnee TO Produce
the desired result
To the.e notes ana 10 Captain Meads oblgns expla-
nat o., we are indebted for The materials of this article
There Il also very Interesting paper on The subject in
Appeton's useful Dictionary OF Machines, &c although
Lit IL herc very erozcousy stated that the catoprc
reflector sysism is the only one IN use in the United
States" p. G6J,
and genius not only for OF The most exquistely
beautiful but also Tor OF the most usefu objects that
the Palace contains.
l. The graceful forms and unmatched co'oring of the
porcelain the magic web the Gobeln tapestries
been for century the theme OF universal admira
ton but in nothing the adaptation OF skill and science
10 the works OF man IN greater dvantage than