KINEMATIC MODELS. 283 



really wonderful simplicity, and one's work is made at the same time 

 much more easy and much more satisfactory. 



These models are very beautiful, but they are also necessarily some- 

 what expensive. I have here a couple of wooden ones, however, which 

 will serve to show that they can be constructed and used in schools 

 without any very extraordinary cost. These two models, and also the 

 stand for carrying them, have been made for me by M. Paul Nolet, of 

 University College. 



I must now thank you for the kind attention with which you have 

 listened to my sketch of the nature of this beautiful collection of 

 models, and I should like also to take this opportunity of thanking 

 Herr Kirchner, of the Berlin Akademie, for the trouble he has taken 

 in preparing and arranging them for me. 



The PRESIDENT : I am sure we have passed a very agreeable half 

 hour in listening to Professor Kennedy's explanations of these most 

 beautiful and instructive models. I think this new branch in 

 mechanism, kinematics, will be extremely useful in helping mechanical 

 engineers in devising improved means to an end, because by com- 

 bining motions into systems, we can resort to any combination that 

 seems likely to answer our purpose, without having to go to the 

 fountain head of our own brains to originate it. I regret that we have 

 so little time to go with Professor Kennedy into the details of the 

 various contrivances put before us, but I hope that Professor Kennedy 

 will give further explanations under the new arrangement which I have 

 had the pleasure of announcing. I will now call upon you to pass a 

 vote of thanks to Professor Kennedy for his interesting communication. 



Dr. MANN : I wish to ask Professor Kennedy if the work he 

 referred to just now was a translation. 



Professor KENNEDY : Yes. 



The PRESIDENT : I will now call on Mr. Barnaby, the Chief Con- 

 structor of the Navy, to give us his communication on Naval Archi- 

 tecture. I will take this opportunity of announcing that we shall have 

 to make some little change in our programme. General Morin arrived 

 yesterday from France, and has to leave again in a couple of days. 

 As we should all like to hear him on the subject to which he has given 

 such very great attention, that of ventilation, it has been thought 

 desirable to take his paper at two o'clock to-day. 



