SATELLITE-TRACKING PROGRAM — ^HAYES 301 



Norrman clock,^^ In addition, they decided that Boiler & Chivens 

 woiild build the mechanical parts of the slave clock, but that the 

 contract for the electronic components would be placed elsewhere. 



By spring of the following year the first model 111 clock arrived 

 in Cambridge. It turned out to be somewhat less reliable than had 

 been hoped, although it did maintain the same accuracy as model 110. 

 Furthermore, since the clock was subject to rather complex break- 

 downs difficult to repair, it required constant and careful maintenance 

 that would prove to be yet another responsibility on the overburdened 

 shoulders of the early observers. The addition of the oscilloscope 

 and other components to model 110 had taxed to the limit the capac- 

 ity and the performance of the original Norrman clock. 



Meanwhile, Shapiro & Edwards of Pasadena, Calif., were awarded 

 the contract for engineering and building the time-presentation 

 system within the camera itself ; and yagi antennas for the reception 

 of WWV signals at 10, 15, and 20 megacycles were ordered, as well 

 as the cable for connecting the crystal clock and camera. 



Early in the summer of 1957 the model 111 was found to be capable 

 of time interpolation during a 6-hour interval to an accuracy of 1 

 ten-thousandth of a second ; during this test the device was continu- 

 ously compared with the WWV signals from the time service station 

 of the National Bureau of Standards. 



The model 111 was put into production at the Norrman Labora- 

 tories, and in September a clock was shipped to South Pasadena, 

 Calif., for testing with the camera itself. 



FIELD ORGANIZATION 



THE BAKER-NUNN CAMERA STATIONS 



At the IGY conference in Barcelona, Spain, in September 1956 

 members of the Observatory stail held lengthy discussions with rep- 

 resentatives from other countries for the establishment and operation 

 of the Baker-Nunn camera stations. Sites were being considered in 

 South Africa, Spain, Iran, India, Australia, Japan, Hawaii, the 

 Netherlands West Indies, Argentina, and Peru, in addition to two 

 in the United States. There were also discussions of the possibility 

 of establishing stations in Egypt, Anglo-Egyptian Sudan, and 

 Ethiopia. 



Agreements for the maintenance of the stations were to be for a 

 2-year period, with the further stipulation that the contracts could 

 be extended indefinitely upon approval of the parties concerned. The 



1^ Tests proved that the model 111 would not only operate the slave clock but would 

 also provide precise voltage for the frequency controlled generator that would supply the 

 motors of the camera. 



