406 
THE MECHANISM OE BICYCLES, 
pression of air in r the cylinders acts as an efficient brake which works almost auto¬ 
matically, since it exerts more retarding action as the machine runs faster. 
The advantages of such a bicycle over the ordinary form are that it enables the 
rider to cover long distances continuously at high speeds with practically no ex¬ 
ertion beyond that required for regulating and guiding it and occasionally assist¬ 
ing it with the pedals when an unusually steep hill is encountered. 
THE CHAIRMAN: There must be, I am sure, many members of the 
Institution who will be anxious to join in a discussion on the exceedingly interest¬ 
ing and clear lecture that we have heard from Major von Donop and also on the 
beautiful machine which Major Holden has shown us, I will in the first place ask 
Captain Lloyd, who has made some particular experiments in this matter, to offer 
some remarks. 
Captain M. B. Lloyd, R.A.: I am afraid that, after the very interesting 
lecture that Major von Donop has given us and the treat we have had in the way 
of seeing all the new machines, what I have to show you is rather dull; but I 
