MACHINERY AND TRIALS OF THE PASSENGER SHIPS—AMERICAN LEGION 
CLASS. 
By RoBert WARRINER, Esg., MEMBER. 
[Read at the thirtieth general meeting of the Society of Naval Architects and Marine Engineers, held in 
New York, November 8 and 9, 1922.] 
When Mr. Rigg read his paper on “The Design and Construction of Passenger Ships” 
at the last meeting in November, it was suggested that there should be a paper on “The Ma- 
chinery of the Passenger Ships, American Legion Class,” and this paper is, therefore, offered 
for the consideration of the members of the Society in the hope that it will be found inter- 
esting from the added circumstance that for these ships we have the results of a model with 
rudder pulled in the tank at Washington, D. C., a self-propelled model run in the same tank, 
and a fairly good standardization trial of the completed ship at a draught corresponding to 
one of those at which the models were tested. 
Mr. Rigg has already given a considerable amount of information in regard to these ships 
in his paper (Transactions of the Society of Naval Architects and Marine Engineers, 1921), 
so that it is only necessary in this paper to give those particulars which have a direct bear- 
ing on the propulsion of the ships. 
These vessels are of the shelter-deck type, with straight stem and cruiser stern. The 
framing is constructed on the longitudinal system, except at the bossing and at the ends. The 
shell plating is arranged with in and out strakes, with overlap butts below the water line. 
The principal dimensions are as follows: 
Teensthyoveraller te tarr Gana eltacdieccre arches iorrars wan wotecega scart 5S 50m 
encothubetweensperpendiculars sorry isco aire iets 518’ 0” 
Breadthtmouldedttrr ammeter eisai lel sy keusiecae enter te ie 
Depth) 'torshadekdeckwarpivsee sete ricer ulcer Alerter cies 50’ 0” 
Designed load (draught from) baselines. 2. ea ys cco iaele er SOMOn 
Corresponding displacement (tons).............2:eeeeeeeees 20,980 
Prialvdrauchip eee ee. tse terse ca kamatra aol. a teeensesiseneuorteareierentaas 24’ 0” 
dirralidisplacemente (cons) mera ee eee erecta: enlcienelcrrele 16,013 
iBecocthcientonpZ4mOm drauehitee en sresciiet aes iterating lel 0.604 
€Coeflicientiofs Mia Syont2 440 mdrauchiceances secrete nici 0.985 
iPrismatichcoehicientsraqre rere wcca setae cera sagt ks casi here oe 0.615 
Wettediisunfacen(Gquatty ace riariatia cere sal setae oa tue oe eesere 45,800 
The two propeller shafts are supported by cast steel spectacle frames in two pieces, 
bolted together at the center line of the vessel, and the framing and plating of the ship are 
bossed out from where the stern tube intersects the hull proper to the point where it attaches 
to the spectacle frame. The keel is of the flat type and the rudder balanced, with double steel 
plates over cast steel frame. 
The propellers are located with their centers 10 feet 9 inches forward of the rudder 
axis. 
