I've recently been in touch with Pat Turner of Turner Model Works /
Finestkind Models about the need for decent S scale barrel models. 
Here's my research:

Pat,

I've been doing some research online since getting your response,
hoping to make some sense of the barrel industry.  The more I
research, the more confused I become.  Let me explain.

The basic construct known as a barrel has been around since the middle
ages.  It is not known when or where the first was built.  The
structure of a barrel has several advantages.  For holding liquids,
since the wood swells when wet, a barrel becomes leakproof after it's
initial wetting.  The shape helps handling.  A barrel tipped on its
side does not land flat, but rocks, distributing the force of impact
to a large surface area.  Due to the bulge shape, one man can roll a
barrel on a flat surface, steering it by tipping the barrel to one
side or the other.  Large heavy barrels can be rolled up ramps by one
or two men by employing ropes with one end attached at the top of the
ramp, looped around the barrel, and pulled up by the men.  By rocking
the barrel, one or two men can lift the barrel on end with "minimal"
effort.

Barrels come in a large variety of sizes, and with a large variety of
names.  Kegs, Rundlets, Firkins, Kilderkins, Barrels, Casks, Tierces,
Hogsheads, Puncheons, and Tuns are all barrels by other names.  Some
of these are specific to particular commodoties.

Size is another mish mash.  I have discovered a history of "barrels"
by whatever name in sizes of 5, 7, 10, 13, 15, and 20 gallon sizes for
what I will call "kegs"; 30, 31 1/2, 32, 36, 40, 42, 53, 59, and 65
gallon "barrel" sizes; a "Tierce" is either 42 or 65 gallons depending
on the commodity; a "Hogshead" is either 63 or 256 gallons depending
on the commodity; a "Tun" is almost always 252 gallons.  These volumes
can also be translated into a variety of dimensional variations again
depending on commodity.  A 42 gallon "Tierce" of wine will be shorter
and fatter than a 42 gallon "Barrel" of oil.

Official United States barrel sizes as per commodity are as follows:

Dry goods, 7,056 cu. in.
Cranberries, 5,826 cu. in.
Wine, 31.5 gal.
Ale & Beer, 36 gal.
Proof Spirits, 40 gal.
Petroleum, 42 gal.
Fish, beef, pork: 200 lb.
Cement barrel: 375 lb.

All that said, I am still trying to locate, so far without success,
the general dimensions of a 42 gallon standard "Barrel" of oil.  I may
be able to extrapolate, but first:

5 gallon keg:  9 3/4" head diameter, 12" belly diameter, 18 1/2" height

10 gallon keg: 12 3/4" head, 15" belly diameter, 21" height

Barrels for fruits, vegetables, and other dry commodities other than
cranberries:
 * Full Barrel, 17 1/8" head, 20 1/4" diam. bulge, 28 1/2" height
   Half Barrel, 13 1/8" head, 16 1/4" diam. bulge, 23" height
   1/4 Barrel and 3/4 Barrel sizes also made

Barrels for Cranberies:
   Full Barrel, 16 1/4" head, 18 1/2" bulge, 28 1/2" height
   Half Barrel, 12 5/8" head, 14" bulge, 22 1/2" height
   1/4 Barrel and 3/4 Barrel sizes also made

* this size barrel also corresponds to the American and Canadian
flat-hooped flour barrel

42 gallon oil barrel:
   head diameter unknown, bulge unknown, height MAY be 32" as per one
source

53 gallon wine barrel:
   21 1/4" head diameter, 25 3/4" bulge, 34 7/8" height

59 gallon wine barrel:
   22 5/8" head, 27 1/2" bulge, 34 7/8" height

63 gallon wine barrel:
   22 5/8" head diameter, 28" bulge diameter, 34 7/8" height

70 gallon "Bordeaux Plus" wine barrel:
   24" head, 29" bulge, 37 1/4" height

Tobacco Hogshead:
   46" diameter head maximim, 54" long staves maximum, bulge unknown.
 These are filled with "dry" tobacco leaves to a weight of 1100
pounds.  Under that weight is charged a penalty, and over that weight
is charged additional shipping fee.

Almost all of these various sizes will have a standard six hoops of
iron.  Larger sizes, like hogsheads, will still probably have only six
hoops, but they may be wider bands.  The smallest kegs may only have
four hoops.  Of particular note, flour barrels were made with bands of
hickory.  Flour mills were notoriously dusty and prone to explosion,
so it was important to prevent an iron band from hitting a floor nail
which could cause a spark, hence the wood hoops.  Another exception
seems to be the larger (French?) wine barrels which often have eight
hoops.

By extrapolating from other representative barrel sizes, I come up
with the following approximation:

42 gallon oil barrel: 17 5/8" head diameter, 22" bulge, 32" height
THIS IS ONLY AN APPROXIMATION, but is probably close enough for most
people.

As you see, "barrels" come in all sizes.  Any particular modeler's
needs will vary considerably.  I am interested in a whole roadside
amassment of tobacco hogsheads.  Most anybody else would not even
care.  I am interested in nail kegs, flour barrels, apple barrels,
beer barrels, and maybe an oil barrel or two.  No, I don't want a cask
of amontillado, thank you.

I hope this gives you some idea of the possible scope of the project.
 Barrels are definitely a thing of the past, but, for those of us
modeling the earlier years, are much needed.

By the way, did you know that pallets were invented for the military
during WWI?  There shouldn't be a single one on a 1910 layout.

Darrell





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