Dow Jones Industrials Weekly Semi-log Chart going back to 1960...
My TradeStation INDU (Dow Jones Industrials) Weekly Semi-log Chart
This chart denotes momentum by comparing the close to the 200 Week SMA (Simple Moving Average). I do it two ways, first price to price, but that has a flaw in that as price fluctuates (more importantly as it gets higher) the relationship gets skewed. So, I use the second method which compares price to the 200 Week SMA via a percentage, which compensates providing a truer graphic of the relationship.
NOTE: This graphic is a screen capture of a chart across two 19 inch monitors. Be advised it is very wide...