108 NON-ROLLING PASSENGER LINERS. 



are for flushing the revolving shaft surface with cooling oil and, together w^ith the 

 exterior holes, serve to hold the bearing under perfect temperature control as 

 described. 



This equipment has undergone additional protracted tests as an ordnance fit- 

 ting, reaching results in this connection which are extremely interesting; operating 

 in this part of the work in conjunction with the base equipment of our latest fire- 

 control system. The exacting nature of these tests and their severity have contrib- 

 uted in no small measure to another extremely interesting result as follows: — The 

 complete knowledge we now have of the behavior of these equipments and the meas- 

 ured results and records have placed us in a position to guarantee unqualifiedly the 

 stabilization of practically any ship to accurate specification and also the equipment 

 by means of which this important result is secured. 



DISCUSSION. 



The President : — You have heard this most interesting paper of Mr. Sperry on "Non- 

 rolling Passenger Liners — Observations on a Large Stabilized Ship in Service, Including 

 the Plant aiid Economies Effected by Stabilization." Are there any comments on the paper? 



Mr. C. P. WethERBEE, Vice-President: — ^I should like to ask Mr. Sperry two or three 

 questions, for this is a very interesting matter. As I understand it, in your stabilizing 

 work, you only stabilized the transverse com.ponent of the ship's motion. You do not make 

 any attempt to stabilize pitching? 



Mr. Sperry: — The relative metacentric heights of any particular ship answers that 

 question. One is 200 or 300 feet. It does not take very much to hold the ship from roll- 

 ing. It is impossible to hold her against the longitudinal motions. 



Mr. WetherbeE: — The great stresses produced on a ship's structure in a seaway, ac- 

 cording to my experience, are produced by the ship rushing into head seas at high speeds. 

 I do not see how the stabilizer will help that situation. 



Mr. Sperry : — That situation does not exist as much as we imagine it does. When the 

 Navy sent our fourteen ships into the Mediterranean in the winter of 1913-1914, we got 

 into tremendous storms going and coming. We had very accurate pitch and roll recorders 

 on board, and we made a number of records at that time. The astonishing thing in search- 

 ing those records is the very slight angle which represents the greatest pitch of any one of 

 these battleships. 



Mr. WethErbeE: — ^It may be that the ship does not pitch, but the sea exerts a tre- 

 mendous force against the ship and produces heavy stresses. You can buckle your decks 

 if you do' not slow down. 



