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
Figure 14.—Wolf trap experimental breadboard with cover removed. The Wolf trap measures 5 × 7 × 7 inches with the cover in place. The sample-collector is extended on the right. The black bottle on the left is the pickup-gas reservoir. Immediately to its right is a release valve and a pressure regulator which are connected to the pickup by the Teflon tubing. The electronics are packaged underneath the gas reservoir, gas valve, and pressure regulator and cannot be seen in this photograph. In front of the assembly, just to the right of center, are the media reservoir and media dump mechanisms. The culture chamber and sensor unit is partially obscured beneath the media reservoir.
