St. Tammany farmer. [volume] (Covington, La.) 1874-current, 1918-03-16
SEA CLOCKS ARE
: IN Big DEMAND
War Causes Shortage Of Chro.
nometers Usedin Ocean
Navigation.
NONE IN THE OPEN MARKET
Price Jumps From $500 to $500 and
over-EneIIshman Who Perfected
instrument Won Prize Of $780,
600 and Thanks Of Mankind.


600 and Thanks Of Mankind.
Washington.-Among the busiest
people supplying the United. States
with war materials are the makers Of
thermometers. Great care and pre-
cislon are necessary In turning out
these navigating instruments, which
are the most accurate portable time
keepers known to science.
Hundreds Of chronometers have gone
to the bottom Of the ocean since
the war began. This alone would
cause a shortage in the ordinary sup
ply, while the equipping of the new
American merchant marine is creating
an unprecedented demand for new in
struments.
At present there are virtually no
chronometers to be had in the open
market. Before the war England sup
piled the world with most Of its fine
chronometers.
In ordinary times good chronome-
ter costs about $500. The present price
Is $500 or better, according to the trade
made. The supply in this country
passes through the hands Of few ex-
perts, who are doing their Utmost to
meet the demand.
From six months to a year and a
half are necessary to make and adjust
a chronometer. The mechanism Is Of
the finest metals, and specially adapt
ed to resistance to extremes Of tenn
perature.
Errors Arc Noted.
No clock or watch has ever yet kept
perfect time, so there is always a
slight gain or loss to a thermometer.
For this reason the chronometer's rate
OF daily gain or loss is determined by
observation ashore, and card show
Ing the rate is made out, and deliv-
cred with the instrument. This rate
Of error is allowed in all notations Of
time. made from the instrument for
working up observations made at sea.
The chsonometer completes, with
the compass and sextant, the trio Of
indispensable instruments required in
modern navigation. By its aid, longi-
tude, or the east or west position Of q
ship, is determined.
Longitude baf1ed all navigators un-
til the thermometer came into use In
1885, The ancients and later naviga-
tors. including all the great discover
,ers. could find their latitude by OBJ
,servations Of the suns height, but they
could determine their longitude only
by dead reckoning" or estimating
their ships progress from day to day.
This. system was uncertain, and
caused great many shipwrecks.
Longitude is merely the difference
t0f time between two points on the
.earth's surface, and 1t became appar-
,ent to students Of the problem it pre-
sented that II an instrument could be
devised that would keep accurate time
at sea, 1t would be possible to find the
longitude Of ships position whenever
weather conditions were favorable.
Time at the ship could be determined.
by an east or west observation of the
sun, morning or afternoon, worked out
by accepted tables. II the time Of q
given point on shore was known
aboard the ship, the difference in time
would give the longitude Of the ship.
/, England was the first nation to cope
with this great problem. In 1714 it ap-
pointed Commissioners for the Dis
,,covery Of Longitude at Sea-" and au-
thorized the payment Of large prizes
to stimulate research to the desired
end. This commission existed until
1923. and distributed more than $780,
600 in prizes.
Wins $4,000 Prize.
The chief prize offered by the com
mission, 100000. was won by John
Harrison, a Yorkshire matchmaker.
who spent his life In perfecting the
thermometer.
Harrison made the best watches in
England. Although Of limited educa-
ton, he conducted many original re-
searches in the expansion Of metals,
In search Of materials for an improved
watch or clock. that would prove inn
pervious to changes Of temperature.
His first great feat was the production
Of a "gridiron pendulum clock" the
first chronometer, which in 1875 he
took to the royal commission. It was
tested by the commission by being
cont nv, q wnvo 90 ~ Ti0hon