The Hawaiian star. [volume] (Honolulu [Oahu]) 1893-1912, 1901-01-30
MEASURING Of VESSELS
DEPUTY COLLECTOR STRATE-
MEYERS HARD JOB.
All of the Island Fleets May Have to
Be Re-Measured-Some Complicated
Calculations.

Deputy Collector Stratemeyer has
been appointed to re-measure the YES
sells of the Island Fleet, and he is busy
studying how to do it, The old mea-
surements in some cases will not be ac-
ceptable to the United States authOrl-
ties and in other cases the owners of
the vessels may ask for remeasure-
ments, hoping the new figures VIII re-
suit in less taxation.
The problem in measurement is to get
the dimensions, with a view to ascer-
tanning the carrying capacity. q. ID.
Claygett, clerk of the United States
inspectors of hulls and boilers has COM
piled the following interesting eXplana-
ton of measurements for tonnage:
There are three distinct meanings at
tached to the term Tonnage In
other words there are three ways of
describing the capacity or internal
measurement of ship, and all of them
are expressed in tons. There is under
deck tonnage, gross tonnage, and net
tonnage; the two latter being some
times designated gross register and net
register tonnage; the net register ton
mage being that which is accessible for
dues or pilOtage, etc. In practice, too,
the term tonnage" is often used to
apply to net register tonnage. The I'M
der-deck tonnage of a ship is the mea-
surement of the cubic capacity of that
tonnage deck, and the tonnage deck is
the second deck from the floor of the
ship. This measurement is stated IN
tons and each of these tons equals 100
cubic feet, so that when it is stated
that under tonnage of a ship is $50 tons,
what is meant is that there are $50 by
100 cubic feet of space under her ton
mage deck. To measure this space 1t is
only necessary to know the length,
breadth, and depth Inside measurment
of cOurse) and the coefticient of fineneSS
which latter practically corrects for the
shape of the vessel being a departure
! from an oblOng box. Thus, if a ship
were a perfect tank her gross under
deck tonnage would be, the length null
tiplied by breadth by depth and divid,
ed by 100 the product of course, being
| cubic feet. The greater the deviation
| from the rectangular tank form the
smaller will be the fraction represent.
ing the coefficient Of fineness The
| gross tonnage or gross register tonnage
| of a ship is simply the undertook ton
mage plus the tonnage. e., number
of cubic feet in hundreds, in all the
| enclosed space above the tonnage deck
One of the principal objects in as
signing tonnage to a vessel is fixing {
| standard on which dues can be levied
Now, it would be manifestly unfair t
| levy charges on a ships gross tonnage
able for money making purposes, i. e.
for the carriage of freight. II
other words, the object of the net regis
ter is to exempt from payment tina
portion of the vessel which does no
earn money. Thus, in the case of tn
average steamer her gross tonnage viii
include under-deck tonnage, plus ton
mage of poop, raised quarter deck
bridge house, deck houses etc, accord
ing to type and constructions; while tn
deductions will include space occupies
by propelling machinery, chart room
masters and officers accommodation
crew space, boatswains stores, etc
With regard to deductions for propell
ing space, it may be stated that tn
plan usually followed is to allow on
and three-quarter times the actual en-
CINE space, etc, to be deducted fTor
the gross tonnage of the vessel.
1t is useful to know that 80 cubic fee
of sea water weigh the ton, also tina
the water displaced by a vessel equal
in volume the immersed section O
the vessel. The dead weight carryin
capacity of a vessel may be taken a
the difference between the weight q
water displaced at light draft and wit
the cargo or lightweight on board. Ne
tonnage is no guide whatever to TN
size of ship. Take, for example, III
"Campania," which is 70, $50 tons gross
but only 4,974 tons net.