First you construct a trinomial tree for a Black-Scholes process with constant drift and volatility.
Here are two different views of the same tree; the first one uses the standard scale, the second one uses the logarithmic scale.
Inspect the tree.
Here is an example of a Black-Scholes process with time-dependent drift and volatility.
Again, you have two different views of the same tree. The first one uses the standard scale, the second one uses the logarithmic scale.
Inspect the second tree.
Compare the two trees.