Page:Concepts for detection of extraterrestrial life.djvu/51

Rh this is would be possible to plot a growth curve. Similarly, a change of acidity can be signaled by the pH detector in terms of rate change, rather than just a yes-no signal.

An essential feature of the Wolf trap operation is the sampling system. Originally a vacuum chamber was used to gather a sample of dust. When the Wolf trap was placed on the floor, a fragile glass shield was broken, allowing