Jan. 14, igr 1.] 
FOREST AND STREAM. 
65 
the minimum weight. In many ways the marine 
engine has been developed to a higher state of 
perfection than the automobile motor, as in the 
marine engine the maximum power is required 
continuously, the driving of a motor boat being 
uphill work all the time in comparison with a 
motor car. 
Accessories will be exhibited, including dif¬ 
ferent makes of propellers, reverse gears, en¬ 
gine carbureters, boat hardware and electric 
ignition outfits and electric lighting plants. The 
exhibit will interest all motor boat enthusiasts 
and yachtsmen who visit the show and will be 
largely attended by people from cities outside 
of New York, it being the only motor boat 
show held in New York city. 
The show will be held under the auspices of 
the National Association of Engine and Boat 
Manufacturers, the association comprising all 
the leading boat and engine building and ac¬ 
cessory manufacturers. Among the special 
features will be the Government exhibition of 
power life saving boats, which will be under 
the supervision of Capt. McClelland, super¬ 
visor of Long Island stations, and a detail of 
life savers. The exhibit will include the largest 
power life boat in the world. 
The Thousand Islands Y. C. will exhibit one 
of its famous 28-foot power boats, while the 
Richelieu and Ontario Navigation Company 
will show the steamer Rapids King, which 
negotiates the dangerous St. Lawrence rapids. 
The Curtiss aeroplanes will be exhibited in 
the concert hall and demonstrations given every 
afternoon and evening. In addition to a series 
of lectures by an expert, Glenn H. Curtiss will 
be on hand during the show to explain the 
I science of aeronautics. In the basement 1,600 
boys_ will compete on sixteen ranges for the 
Public Schools Athletic League rifle shooting 
championships. 
Inventor of Barometer. 
Torricelli invented the barometer in the 
seventeenth century. It was a tube of mercury 
then; in many cases it is a tube of mercury still. 
The tube is a yard long and about half an inch 
in diameter. It is open at one end and closed 
at the other, and is partly filled with mercury. 
The open end dips into a little trough of mer¬ 
cury or is bent slightly upward in the form of 
a tiny cup. The top of the mercury column is 
exposed to view and by means of a scale along¬ 
side of the column its height is read off. These 
are the essentials in the construction of the 
ordinary instrument, says the Marine Journal. 
What is known as the wheel barometer, so 
often met within houses, is an ingenious varia¬ 
tion of Torricelli’s idea. This barometer was 
invented by Robert Hooke, probably the great¬ 
est philosophical mechanic of his day. It is in¬ 
tended to indicate the weather without observ¬ 
ing the mercury itself. There is the usual tube, 
but bent at the bottom into a short leg. In 
this leg a little glass float rests upon the sur¬ 
face of the mercury. A cord attached to the 
float passes over a pulley. The pulley is furn¬ 
ished with a pointer which moves round the 
dial, the moving agency being the rising or 
falling mercury, which lifts or lowers the float. 
As regards modern barometers, everybody is 
familiar with the aneroid—a very beautiful port¬ 
able and accurate instrument independent of a 
column of mercury, and the danger to which it 
is liable from spilling. The aneroid consists of 
a metal box partly filled with air. One face of 
the box is corrugated and so thin that it yields 
to the variations of the atmospheric pressure. 
Then there is the self registering barometer, 
which writes its record on paper wound on a 
drum. The drum revolves by clockwork. A 
pencil connected with the barometer presses 
upon the revolving paper and rises and falls 
with the mercury. When the mercury falls the 
line drawn by the pencil slopes down; when it 
rises the line slopes up. 
The Forest and Stream may be obtained front 
any newsdealer on order. Ask your dealer to 
supply you regularly. 
Gas Producer Plants. 
Charles B. Page, at the recent meeting of 
the Society of Naval Architects and Marine En¬ 
gineers, read the following paper on, “Two 
Marine Installations of Producer Gas”: 
Last year, the members of the Society had 
the pleasure of listening to an article on “The 
Producer Gas Boat Marenging,” by Mr. H. L. 
Aldrich. The profession as well as vessel 
owners are deeply indebted to Mr. Aldrich for 
taking the first step toward what must shortly 
be a very extended use of producer gas power 
on shipboard. 
While the Marenging was but forty feet in 
length and powered with a 25-horse plant, the 
practicability of marine producer gas power 
was amply demonstrated at least for small 
powers. The next boat to be fitted with pro¬ 
ducer gas was the auxiliary Geodetic Survey 
yacht Carnegie. The power plant consisted of 
a 150-horsepower anthracite coal producer and 
a four-cylinder, four-cycle, regular type marine 
engine adapted to the use of producer gas by 
enlarged inlet and exhaust valves and passages 
and increased compression. Both producer and 
engine were constructed largely of non-mag- 
netic materials and were especially notable be¬ 
cause of. this fact. The Carnegie has been in 
commission since the summer of 1909, has 
made. one round trip across the Atlantic, is 
now in the southern hemisphere, and is ex¬ 
pected shortly to go to Australia. 
The next installations of marine gas power, 
so far as I am informed, were made in the 
power boat Mary A. Sharp, operating on Ches¬ 
apeake Bay and tributaries, and the Superior, 
of Bayfield, Wisconsin. These two boats are 
the first commercial craft, certainly of any size, 
in America to be powered with producer gas. 
Their principal dimensions are as follows: 
MARY A. SHARP. 
Length over all . 66ft. 
Beam . 14ft. 6in. 
Depth of hold . 5ft. 3m. 
Producer— 
Height . 6ft. ioin. 
Diameter of shell . 4ft. 
Engine, three-cylinder . 75 B.H.P. 
Bore . 9in. 
Stroke . i2in. 
Air starting and reversing and direct 
connection to propeller shaft. 
Propeller, 3-blade— 
Diameter . 44m. 
Pitch . 56m. 
t 
SUPERIOR. 
Length over all . 65ft. 
Beam . 12ft. 9m. 
Depth of hold . 4ft. 
Producer— 
Diameter of shell . 3ft. 6in. 
Height . 6ft. 6in. 
Engine, two-cylinder . 50 B.H.P. 
Bore . 9m. 
Stroke . I2in. 
Air starting, fitted with reverse gear. 
Propeller, 3-blade—• 
Diameter . 40m. 
Pitch . 54m. 
a 
The same general description will cover the 
interesting points of the power equipment of 
both boats. The producers used in both in¬ 
stallations are the same type and make as 
fitted in the Marenging and Carnegie. The 
producer is a cylindrical steel shell lined with 
asbestos and fire-brick to such thickness that, 
when running at full load, the heat radiation is 
not important. While the shell is rather warm 
to the touch, it cannot be regarded as hot. 
With proper ventilation this heat in summer is 
not objectionable, while it is most agreeable 
in other seasons of the year. The whole 
principle being one of suction or vacuum, there 
is no escape of gas into the boat. The writer 
has been aboard the Mary A. Sharp after she 
had been closed up for a week, excepting about 
half an hour ever other day, when a little ad¬ 
ditional draft was given to the producer to keep 
ARTHUR BINNEY 
(Formerly Stewart & Binney) 
Naval Architect and Yacht Broker 
Mason Building. Kilby Street, BOSTON, MASS. 
__ Cable Address. “D esigner,” Boston 
COX STEVENS 
Yacht Brokers and Naval Architects 
15 William Street - New York 
_ Telephones 1375 a nd 13T6 Broad 
GIELOW (St ORR 
Naval Architects, Engineers and Yacht Brokers 
Plans, Specifications and Estimates furnished for Construction, 
Alteration and Repairs. Large list of Yachts for Sale, 
Charter or Exchange; also Commercial Vessels. 
52 BROADWAY Telephone 4673 Broad NEW YORK 
Canoe Handling and Sailing. 
The Canoe: History, Uses, Limitations and Varieties, 
Practical Management and Care, and Relative Facts. 
By C. Bowyer Vaux ("Dot”). Illustrated. Cloth, Id 
pages. Price, $1.00. New and revised edition, with 
additional matter. 
A complete manual for the management of the canoe. 
Everything is made intelligible to the veriest novice, sad 
Mr. Vaux proves himself one of those successful in¬ 
structors who communicate their own enthusiasm to 
their pupils. 
FOREST AND STREAM PUBLISHING CO. 
My Friend The Partridge. 
S. T. Hammond. A delightful reminder of crisp 
autumnal days in the covers. It tells of sport with the 
noblest of game birds, the habits and habitat of the 
ruffed grouse, with just the right touch of reminisceace 
and personal experience. Cloth. Illustrated. 160 pares. 
Postpaid, $1.00. 
FOREST AND STREAM PUBLISHING CO. 
CORRESPONDENCE. 
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