This currency converter produces present-worth values for money through history, using a wealth of different systems. It applies to the UK and US, and depending on the method used, you can get price and value comparisons all the way back to 1257.
In 2004, $1.00 from 1900 is worth:
$22.37 using the Consumer Price Index
$19.02 using the GDP deflator
$108.01 using the unskilled wage
$149.07 using the GDP per capita
$575.24 using the relative share of GDP
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missing an important index....the ENR (Engineering News Record index) where construction and engineering costs are calculated