更多actinometer例句

1. For judging long exposures, the use of an actinometer (issued in many inexpensive forms) is helpful.
2. We then shift the paper in the actinometer so as to get a fresh portion under the tissue strips, or we substitute a new piece.
3. Now refer to the actinometer and see what has taken place on the silver paper which we put into it.
4. The mystery was not a new type of infernal machine as they imagined but merely a home-made actinometer!
5. A very suitable instrument for timing the exposure of carbon tissue is Sawyer's actinometer.