Smithsonian Report. 1960 — Draper 



Plate 2 



CONDITIONS AT A GIVEN 

 FLIGHT POSITION 



CONDITIONS AT 

 START OF FLIGHT 





AXIS 



EARTH-ROTATION- 

 CORRECTION 

 CLOCK DIAL 



PENDULUM 



V CENTER OF EARTH 



® GYRO HOLDS AXIS DIRECTION CONSTANT WITH RESPECT TO FIXED STARS, THAT IS, WITH 

 RESPECT TO AN INERTIAL REFERENCE SPACE. 



(2) DIAL ROTATION WITH SIDEREAL TIME CORRECTS FOP EARTH ROTATION TO GIVE AN 

 EARTH REFERENCE SPACE. 



® DIRECTION OF GRAVITY AT START OF FLIGHT, WITH RESPECT TO THE EARTH REFERENCE 

 SPACE. 



DIRECTION OF GRAVITY AT FLIGHT POSITION REPRESENTED BY DOTTED LINES, WITH RE- 

 SPECT TO THE EARTH REFERENCE SPACE. 



® INDICATED ANGLE OF TRAVEL IS PROVIDED BY ANGULAR DISPLACEMENT, IN EARTH REF- 

 ERENCE SPACE, OF DIRECTION OF GRAVITY WITH RESPECT TO ITS POSITION AT THE 

 START OF THE FLIGHT. 



Ineriial system siniplilicd lo illustrate elements of navigation for vehicles moving at sub- 

 stantially constant altitude. 



