Jan. 1% 1903.1 
FOHKST . AND ^ STREAM. 
S7 
20-FOOT WATERLINE KNOCKABOUT DESIGNED BY JOHN R. BROPHY, 1902. 
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20-FOOT WATERLINE KNOCKABOUT CONSTRUCTION PLAN- — DESIGNED BY JOHN R. BROPHY, 1902. 
rial Club, I hereby appoint Mr. J. E. Isgrigg secretary 
iro tem. Mr. Isgrigg has kindly consented to assume the 
uties. of the position until the annual meeting of the 
lub, to take place at Chicago during the last week of 
larch, next, at which time officers for the ensuing year 
re to be elected. All communications relating to the 
American Championship Field Trial Club should be ad- 
Iressed to Mr. J. E. Isgrigg, Chicago, 111. Box 166. 
James Pease, 
President American Championship Field Trial Club. 
The report at hand considers four large plantations, 
concerning which a multitude of facts are given and 
rnany beautiful illustrations, and then draws conclu- 
sions from the study of these plantations. Mr. _von 
Schrenck's_ paper shows that this tree is subject to 
very feW diseases. 
The Hardy Catalpa. 
The Bureau of Forestry of the U. S. Department of 
Lgriculture, of which Mr. Gilford Pinchot is chief, has 
ecently issued a very interesting and useful Bulletin, 
•iving a description of the hardy catalpa in commer- 
1 plantations by Mr. Wm. L. Hall, superintendent 
i ree planting, to which is added remarks on the dis- 
^~es of this tree by Hermann von Schrenck. Patholo- 
'-t in charge of the Mississippi Valley Laboratory. 
It has not been generally known that "the catalpa is 
r great value as a commercial tree, especially for such 
Lirposes as fence posts, telegraph and telephone posts 
jnd railroad ties, but its value has recently been fully 
lemonstrated. It ranks with locust and osage orange 
I: durability while surpassing them in rate of growth 
Ind other qualities. Its value has led to extensive 
jlantings west of the Mississippi River, and it has 
roved itself to be a useful tree and one which re- 
irns a good yield on capital invested. The tree is 
nrive to the Ohio Valley, but it has been planted in 
jiithern Iowa, Nebraska and eastern Kansas, with 
rry favorable results. 
— <^ — 
Twenty-Foot Waterline Knockabout. 
The lines of a 20ft. racing length knockabout pub- 
lished in the current issue are by Mr. John R. Brophy, 
of Brooklyn. The craft is designed for sailing prin- 
cipally in the lower bay, and when completed will be 
enrolled in the New York Canoe Club and the Brook- 
lyn Y. C. She will be entered in all of the races occur- 
ring on Gravesend Bay, to which she is eligible. 
The drawings call for a staunch boat of large dis- 
placement and small percentage of ballast, designed to 
the Y.aclit Racing Association of Long Island Sound 
rules. The boat, however, measures practically the 
same under the new rule of the New York Y. C. For 
the sake of comparison the rating under each rule is 
given. 
The dimensions follow: 
Length- 
Over all ■ 30ft. 
L. W. L 2oft. 
Breadth — 
At deck 7ft. 6in. 
At L. W. L. 7ft.. . 
Draft— ' ^ 
Greatest sft. 
To rabbet 2ft. 
Freeboard — 
Forward 2ft. 7'm. 
Aft (at side line) 2ft. 
Least I ft. gin. 
Displacement (100 cubic feet) 6,400 lbs. 
Lead keel , 3,000 lbs. 
Sail area' — 
Actual 595 sq. ft. 
New York Y. C. new rule 626 sq. ft. 
Y. R. A., L. I. S 614 sq. ft. 
Area of midship section — 
Submerged (No. 5^) 1O.62 sq. ft. 
L. W. L. plane 97.91 sq. ft. 
Lateral plane, including rudder 58.66 sq. ft. - 
R.. M.,' new rule New York Y. C 20.2 ft. 
R. L., new rule Y. R. A., L. I. S 20.89 ft. 
Center of buoyancy, from fore end of 1. w. ].. io.8^ft. 
Center of gravity, from fore end of 1. w. 1. . . 11. 034ft. 
Center of lateral resistance, from fore end of 
1- w. 1 1 1.8 ft. 
Center of efifort of sails, from fore end of 
1- w. 1 lo.S^ft. 
The Origin of the Centerboard* 
Editor Forest and Stream: 
Having seen from time to time some controversy in 
various papers of the country relative to the centerboard 
and the invention thereof as applied to sailing vessels, 
I thought I would give you my version of the same which 
