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B a r o m e t e r
HoW It WorKS
A barometer measures changes in atmospheric pressure, which you can think of as the weight of the air above you. Chang-
es in atmospheric pressure at any given point typically foretell changes in the weather. Weather watchers therefore note
a barometer's reading, then observe how much and how fast the reading rises or falls. Rising pressure signals improving
weather, while falling pressure portends deteriorating weather. The barometer works best when mounted indoors where air
pressure is the same as that outside, but the instrument is less subject to the elements.
The Chelsea Shipstrike barometer is an aneroid barometer. This means it measures atmospheric pressure mechanically,
without mercury or other fluids. Instead it uses a vacuum and a hollow metallic diaphragm. Pressure changes on the
diaphragm cause the black indicator hand on the dial to move. You can manually position the stationary gold hand over
the black indicator hand, and return later to note how much the pressure has changed and whether it is rising or falling.
Barometers measure atmospheric pressure in inches, millibars, and centimeters. At sea level, normal atmospheric pres-
sure is approximately 29.92 inches, 1014 millibars, or 76 centimeters. At higher elevations, the average pressure will be less
because there is less air pressure overhead. Normal weather variations cause the pressure to rise or fall an inch or less
so you may see little movement of the black hand for several days at a time. A passing storm often brings rapidly falling
pressure.
SEttInG For local altItudE
When a Chelsea barometer leaves our factory it is adjusted to register pressure at sea level, which is the standard way to
measure barometric pressure regardless of location or altitude. Since atmospheric pressure decreases as altitude increas-
es, if you are in a higher altitude location it will be necessary for you to adjust the barometer to give you a reading cor-
rected to sea level. To do this, call the local weather bureau and ask for the present barometer reading. Then adjust the
barometer's black indicator hand to the reading given. This can be accomplished by turning the small screw on the back
of the barometer case. If you are at an altitude of 5,000 feet or greater, the barometer should be adjusted professionally.
carInG For tHE caSE
Chelsea Clock cases are constructed of exceptionally high quality brass, highly polished to a fine finish, and then care-
fully lacquered for long-lasting protection. The chemicals in fingerprints and even ordinary dust may eventually mar this
finish. Therefore, we suggest cleaning the case weekly with a clean soft cloth. Do not use polish, cleaner, or other liq-
uids that could tarnish or pit the finish. Treated with this care, the lacquer coating will not be broken and the clock case
should retain its bright appearance for many years.
SErVIcInG tHE clocK or BaroMEtEr
Under normal operating conditions, the clock should be cleaned, oiled, and adjusted about every five to seven years. Con-
ditions such as extreme heat, cold, dust, and even idleness can adversely affect lubricating oils and therefore necessitate
more frequent servicing. A Chelsea Clock is a precision instrument that should only be serviced by our master clockmak-
ers. When the clock or barometer requires cleaning or service, we urge you return it to our factory repair center where
an experienced master clockmaker will insure careful, efficient, and guaranteed work. Please take extra care to double-
box the clock to avoid damage in transit. You can find further packing and
shipping advice online at www.chelseaclock.com.
lIMItEd WarrantY
This new Chelsea instrument is warranted against defects in material and workmanship for two (2) years from the date of
original purchase. In the event of any such defect, return the instrument postage prepaid, along with an explanation
of the defect to the address set forth below, and we will repair or replace, it at our option and expense. Any defects or
damage caused by misuse, accident, tampering, or user negligence is not covered by this warranty. Be certain to care-
fully and securely pack the instrument for return. We will not be responsible for damage during shipment. The repaired
or replacement instrument will be returned postage prepaid. All implied warranties covering merchantability, fitness for
particular purpose, or otherwise are limited in duration to two (2) years from the date of original purchase. The repair
or replacement of any defect is the exclusive remedy under this warranty. In addition, the warrantor shall not, under any
circumstances, be liable or responsible hereunder for consequential, incidental, indirect or special damages. Note that
some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or
consequential damages, so the foregoing limitation or exclusion may not apply to you. This warranty gives you specific
legal rights; you may also have other rights that vary from state to state.
Two Hundred Eighty Four Everett Avenue, Chelsea, Massachusetts 02150-1515 | Tel 617 884-0250 | chelseaclock.com
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Questions and answers
On a 6" Chelsea ShipStrike clock, does the strike main spring unwind when the strike is turned off? Also, my clock still has the plastic thread that protects the hammer during shipment. If I leave it in will that be problem My clock is an 04.
The strike main spring does not unwind when the strike is turned off on a 6" Chelsea ShipStrike clock. There is no information provided about whether it is a problem to leave the plastic thread that protects the hammer during shipment in a Chelsea ShipStrike clock model 04.
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