FREE BOOKS

Author's List




PREV.   NEXT  
|<   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47  
48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   >>   >|  
t reached the ground in safety; and this first attempt, crowned with such decisive success, secured for ever to the brothers Montgolfier the glory of one of the most astonishing discoveries. "When we reflect for a moment upon the numberless difficulties which such a bold attempt entailed, upon the bitter criticism to which it would have exposed its projectors had it failed through any accident, and upon the sums that must have been spent in carrying it out, we cannot withhold the highest admiration for the men who conceived the idea and carried it out to such a successful issue." Etienne Montgolfier has left us a description of this first balloon. "The aerostatic machine," he says, "was constructed of cloth lined with paper, fastened together on a network of strings fixed to the cloth. It was spherical; its circumference was 110 feet, and a wooden frame sixteen feet square held it fixed at the bottom. Its contents were about 22,000 cubic feet, and it accordingly displaced a volume of air weighing 1,980 1bs. The weight of the gas was nearly half the weight of the air, for it weighed 990 lbs., and the machine itself, with the frame, weighed 500: it was, therefore, impelled upwards with the force of 490 lbs. Two men sufficed to raise it and to fill it with gas, but it took eight to hold it down till the signal was given. The different pieces of the covering were fastened together with buttons and button-holes. It remained ten minutes in the air, but the loss of gas by the button-holes, and by other imperfections, did not permit it to continue longer. The wind at the moment of the ascent was from the north. The machine came down so lightly that no part of it was broken." Chapter V. Second Experiment. (Charles's Balloon, Paris, Champ de Mars, 27th of August, 1783.) The indescribable enthusiasm caused by the ascent of the first balloon at Annonay, spread in all directions, and excited the wondering curiosity of the savants of the capital. An official report had been prepared, and sent to the Academy of Sciences in Paris, and the result was that the Academy named a commission of inquiry. But fame, more rapid than scientific commissions, and more enthusiastic than academies, had, at a single flight, passed from Annonay to Paris, and kindled the anxious ardour of the lovers of science in that city. The great desire was to rival Montgolfier, although neither the report nor the letters from Annonay had made mention o
PREV.   NEXT  
|<   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47  
48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   >>   >|  



Top keywords:

Montgolfier

 

Annonay

 

machine

 

fastened

 
ascent
 

report

 

Academy

 

balloon

 

weighed

 

moment


attempt

 

button

 

weight

 
Experiment
 
covering
 
buttons
 

Second

 

pieces

 

signal

 

Balloon


Charles

 

Chapter

 

imperfections

 
continue
 

longer

 

permit

 
broken
 
minutes
 

lightly

 
remained

excited
 

passed

 
flight
 

kindled

 
anxious
 

ardour

 

single

 
academies
 

scientific

 

commissions


enthusiastic

 
lovers
 

science

 

letters

 
mention
 

desire

 

caused

 

enthusiasm

 
spread
 

directions