更多heliometer例句

1. A rival method to that of the heliometer has been discovered in the photographic telescope.
2. On an entirely different plan is a survey just concluded by Chase with the Yale heliometer.
3. These require extension, because the differential methods of the heliometer and the camera cannot otherwise be made absolute.
4. The heliometer is a telescope with its object-glass cut in half along a diameter.
5. The instrument he is to use should be that marvellous piece of mechanical and optical skill known as the heliometer.