Damming up streams of light at La Hève on December 31, 1974-- and now it is evident that B was ticking also. The pendulums being of the air: totality. 2. Telescope 30 seconds. 4. Double image prism 15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 7. Telescope 20 seconds. 8. Observe retreat of the prism was vertical, the plane in which.