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Eclipse Bulletin No. 3 cont'd. 7. RADIO RECEPTION The purpose of this project is to study the local effect of the eclipse on the ionosphere by measuring changes in signal strength. The installation consists of three or four receivers with signal strength meters. These are tuned in on diff- erent radio stations both in the line of the eclipse and off the path. To establish a norm, the equipnent should be in operation for a full hour before first contact and a full hour after fourth contact. During these two one-hour periods, signal strength readings should be taken every minute. During the eclipse partial phases and totality - readings should be recorded more frequently. Ten-second intervals are suggested but these should be somewhat longer - 15 or 20 seconds - if it is found that the signal remains fairly steady. If possible, the equipnent should be installed on the previous day and the team should go through the full routine for the same period as on eclipse day. Not only will this furnish comparison graphs but will give the teams the practice needed to carry out operations smoothly on eclipse day. Two persons should be assigned to each receiver so that they can work on shifts. A special report form is being drawn up for this project and is available on request. * * * * * * We realize that the brief descriptions given here may leave some questions unanswered. If you have any particular problems, please let us know and we shall try to help you solve them. Additional copies of this bulletin and the report form are available, in limited quantity, on request. Bulletins 4 and 5, covering Photo graphic Projects and Visual Observations, will be issued shortly. In planning your programme we would caution you against being too ambitious. The period of totality is very short. There will be no tine for flase starts. It is better to undertake only one pro ject and cb it well than to attempt several with in- different results. Also, if you have never seen a total eclipse of the sun, you will want some tine just to enjoy this wonderful spectacle. So plan your programme well, practice the routine, become thoroughly familiar with your equipment, and weather permittingi - all will go well on eclipse day. Please let us know about your plans as they develop and about any special projects you may have in mind. Isabel K. Williamson National Co-ordinator 1963 Eclipse 5162 Belmore Avenue, Montreal 29, Canada. - 5 -