i STEAM COAL - Clpdigital.org

THE COAL TRADE BULLETIN. 35
A PORTABLE BOILER AND AIR COMPRESSOR.
There is a demand in many industries for a
portable air compressing outfit which can easily
be carried from one location to another and used
for the operation of drills, chipping and riveting
tools, sand blasting and similar purposes. The
outfit illustrated herewith has been designed at
the Clayton air compressor works, 114 Liberty
street, New York City. It is entirely self-contained,
as the boiler, compressed air receiver, air
compressor and circulating pump for cooling the
air cylinder jackets are all mounted on one truck.
For riveting hammers the compressor is proportioned
to deliver air at about 100 pounds
pressure per square inch, while for sand blasting
and stone tools, air is supplied at 70 pounds pressure.
The receiver permits the storing of air
so that a much larger number of tools
may be operated than otherwise, since
it is only occasionally that all
tools are in operation at the
same time. The pressure of
the air is maintained by a pressure
governor, while the compressor
is prohibited from
running away, in case of a
break on the air line, by a flyball
speed governor, the two
governors being so combined
that they operate upon a common
throttle valve. The com­
COASTWISE COAL SHIPMENTS.
Coastwise coal shipments for 1903 and 1904 compare
as follows:
1904. 1903.
Tons. Tons.
From New York 21,296,400 18,040,094
From Philadelphia 5,542,264 6,215,321
From Baltimore 2,302,788 1,731,896
From Newport News 2,655,697 1,790,479
From Norfolk 2,119,513 1,673,940
Total 33,916,662 29,451,730
Of the amount for 1904, 18,925,549 tons was soft
coal and 14,991,H3 tons anthracite. The figures
include the coal supplied to the coastwise vessels
for their own use as fuel. In 1904 such coal
amounted to 3,436,084 tons. Of the New York
shipments, the largest single item—nearly half of
the total—covers the tonnage ferried from the
several New Jersey termini to Manhattan. Boston
receives the heaviest shipments from all the above
ports, but New York City receives almost no coal
pressor engine exhausts into the stack, thus increasing
the draught. The air compressor cylinder
walls are jacketed and are supplied with
cooling water by a small duplex pump.
by water from other than the immediate harbor
points, as above mentioned.
Trade on the great lakes during the two years,
among all domestic shipping and receiving ports,
may be stated thus: 1903. 1904.
Shipments: Tons. Tons.
Anthracite 3,931,693 3,459,212
Bituminous 10,876,111 10,666,012
Total shipments.. 14,807,804 14,125,224
Receipts:
Anthracite 3,829,389 3.463,102
Bituminous 9,516,954 9,568,941
Total receipts 13,346,343 13,032,043
Shipments, as in the Atlantic coastwise trade,
include coal supplied for vessel fuel. Shipments
to Canadian lake ports, not included in the above
totals, were, in 1904: Anthracite. 1,660,453 tons;
bituminous, 4,656,900 tons, showing, as compared
with 1903, an increase of 25,649 tons of anthracite
and a decrease of 362,514 tons of soft coal.