更多heliostat例句

1. In a short time we might earnestly wish for a centrifugal apparatus or a heliostat.
2. Images of the sun are thrown into the observatory by an ingenious instrument run by clockwork, and called a heliostat.
3. In the absence of a heliostat the latter was the more convenient.
4. It is a good object by which to adjust my hand heliostat, which I describe below.
5. In the absence of a heliostat it is more convenient to obtain a point of light with the aid of a lens of short focus.