New-York tribune., 1907-11-24
PHoToGRAPHING MARS.


of 1S-inch lens. and each of the many little
images shown the plates was taken eeDa-
Tately. The telescope was adjusted so that the
nanet was in the centre of the camera field.
then the plateholder carrying the sensitive
Mate was placed in the carrier Of the planetary
ca1nera and set IN position for the first image
the slide then being drawn from the plate
holder bulb in the right hand opened the
shutter Of the camera. allowing the light from
he planet TO fan the sensitive plate with
En exposure OF about two seconds. Then q
bulb in the left hand shifted the plate quar-
ter Of an inch for the succeeding image; and so
on through the entire series of images taken on
one plate. Sometimes the uIste was arranged
10 shift from right TO left and sometimes in a
vertical direction
night virtually no light except that from Mars
reached the plate, and the latter was MOI in
capacitated by one exposure from receiving
other sensitive impressions. About half an hour
was consumed in taking the sixty images on
some of me plates, and eight or ten plates were
exposed in one nights work. In ali about ten
thousand negative images were taken. The
plates represent the work that was done under
the most favorable conditions Of Atmosphere
Ihe one OF JuiH 10, taken during the nearest
approach OF the planet 10 the earth. vas a. {.
distance Of IS 10000 miles When Mars v-as
a. or near the zenith, il was necessary for mo
10 lie on my back while taking the pEotogra pas
As the hest@ seeing" occurs in flashes" the
successive images on the same negative NAV
differ somewhat in wealth of finer detail: 20 the
skilled eye All show the larger canals with re-
naarkaole clearness, though the more delicate
details are lost in reproduction. OF the ten
thousand separate images Of the planet none Is
oesutute OF canals, and in some eases as many
& twenty five o. thirty canals have been count
ed in a single image. Several Of the previously
observed double canals show their duality on
me piates taken during the intervals of best
atmospheric conditions
This has been only the second opposition of
Mars during which the canals have been sue
oessfully photographed. The first and only pre-
Tious successful Photographic impressions of
tne canals We're obtained at the Lowell Observa-
tory, Flagstaff, Ariz. during the opposition of
nd Ski g - q
Lampiand. Two years will elapse before an
other opposition OF the planet when it makes
sun nearer approach TO the earth and after
that no favorable opposition will occur for a
period of fifteen years.-E. c. Slipher in The
Century.
HOW THEY LOADED AN AFRICAN SLAYER
The king. queen royal family. chiefs and
people were invited on board. They had pre-
Niously been treated somewhat sparinEly with
liquors. In the mean time all the water casks
We're filled and mostly slowed in the lower hold
All, together with all the stores and goods on q
platform resting on the keelson 4 very large
supply OF irons had been taken on board at
CsfGenas he trading had been proceeding on
tne upper deck and large supply of the va
!Iouo al uc-es OF food laid in. and all was
lneht had arrived. Two large puncheons were
I40eu on zoe upper deck and the heads knocked
a.. 1Llu ABOUT twenty-five or more gallons of
EIohe I;m put into each puncheon, also hun
cree weight or so Of sugar and a bushel Of
- HiLes' 10 these were added a specific quan-
uty OF d certain drug which would presently
produce prolonged stupefaction The between
ana lower decks were swept clean and all ,vac
n readiness for the company. They came
KING, queen, royal family, chiefs and people
70 the number Of about fifteen hundred As
iast as they came on board they 7vere piled with
The drueged punch; many soon became stupid
or helpless and were placed below 10 make room
Tor others When they were all on board and
most OF thehi stnpehed, they were seized, ironed
and passed below. The first row were seated
with the knees drawn up close 70 the side of
me NeSsei. ore arm put through the beckett and
irons capped on. In the next row another arm
was put through the same beckett one bolt and
:beCket thus answering for two persons II will
5be remembered that the main hatchwav was
parutioned in the middle and the after part
enclosed between decks, giving separate con-
neetion with the temporary deck. A wide and
short ganGboard was Placed from the after side
81 the hatchwaE TO the temporary deck well
slantlng, and the captives destined for the
lower deck were placed on this and slid down.
when they were packed and secured. The be
tween decks were packed full with nearly eight
hundTed and about five hundred were on the
temporary deck. There were still two hundred
or more that they had neither room nor irons
for. They might have been dropped into the
periGguas and left to find their way ashore
when they came to their senses. II was too
late: the periaguas had been ci,t adrift as soon
as they began to secure the ca ptives. Now the
anchor was tripped, sail hoisted and the SLAYER
taribbee as she as afterward called,
miles away before the last were secured. Many
~ those remaining were now coming 10 their
senses Do you ask what became of them?
They were shot and thrown overheard: such
was the record.-T. 3. Briggs. in Harper's.
JOSIAH WEDGWOOD's FAMOUS POTTERY.
wedgwood achieved his great fame as the
inventor and producer of iasperware This in
vention was the result of his great love for the
classic art and classic history to which he was
introduced by Bentley. WedgWood was intent
on widening the field of ceramic art and longed
% initiate the canoes of Greece and Rome.
AFTER years of patient and secret experimenting
ne produced in 1175 the Jasperware so insepa-
Taby connected with his name and through
which much Of his fortune acquired. This
ware Is Of an extremely delicate texture It's
ingredients are sulphate Of baryta, carbonate
o. baryta, clay and flint. In the earlier pieces
the entire body was stained with the metallic
oxide used for coloTing This is known as solid
ana evenness in the coloring of the fields, the
later forms received merely a wash of the
metallic oxide and are distinguished by the
Term Jasper dip" Every stage of the process
needed the most careful attention. Much de-
pended upon the grinding and mixing of the
materials. still more the firing of the moulded
OBJECTS. The process apparently simple,
Wnen II was mastered. The best modeers were
employed TO make the original wax models
many from life, others from paintings prints
ana medals. Clay moulds were taken from the
wax model and fired. Into these the plastic
clay was pressed. The reliefs obtained there
from sere placed in their colored bases, and
Nelle still soft were gone over by a modeller,
"ho retouched them when necessary and did a
certain amount OF the undertaking which is
70 neautifu feature of all of the jasperware
q Josiah Wedgwood's period. The pieces were
men fired. II was not until 1777 that wedg-
,reoo perfected his process and became abso-
Le,eiy sure OF his results. Danger in firing was
soonterated and great height in reliefs made pos
sDe'-R 7. II. Halsey in Scribner's.
lHE PASSING OF THE AGE OF INVENTION.