DR PETTIGREW ON THE PHYSIOLOGY OF WINGS. 



407 



made to revolve with immense energy, so much so that the model rose to a great 

 altitude, and flew across two fields before it alighted. The motive power 

 employed in the present instance was obtained from the combustion of charcoal, 

 nitre, and gypsum, as used in the original fire annihilator, the products of 

 combustion mixing with water in the boiler, and forming gas charged steam, 

 which was delivered at a high pressure from the extremities of the eight arms. 

 This model is remarkable as being probably the first which actuated by steam 

 has flown to any considerable distance.""" The French have espoused the aerial 

 screw with great enthusiasm, and within the last few years (1863) M. M. NADAE,t 

 de Pontin d'Amecourt, and de la Landelle have constructed clockwork 

 models (prthopteres) , which not only raise themselves into the air, but carry a 



Fig. 53. Flying Machine designed by M. de la Landelle. 



certain amount of freight. These models are exceedingly fragile, and because of 

 the prodigious force required to propel them usually break after a few trials. 

 The above woodcut (figure 53) embodies M. de la Landelle's ideas. 



* Report on the First Exhibition of the Aeronautical Society of Great Britain, held at the Crystal 

 .Palace, London, in June 1868, page 10. J 



f Mons Nadar in a paper written in 1863, enters very fully into the subject of artificial 

 -S; a a r P r ^ n 7 . S d ° f ^ SCrW - Liberal 6Xtracts are S iven from Nad ar's paper in 



vnW ? y P f n ? A J T ° N TURNER - L ° nd0D ' 1865 ' ^ 34 °- To TuRNER ' s Wsome 



volume the reader is referred for much curious and interesting information on the subject of 



VOL. XXVI. PART II. 



5 N 



