Geology Reference
In-Depth Information
A Marchant Calculating Machine.
The size of a foot-stool and 'representing the apex of achievement
in 36 years of continuous improvement in the calculating machine
art', this electrically operated and fully automatic calculator
performed multiplication, division, addition and direct subtraction
at 1300 counts per minute, 'with all keyboard controls conveniently
grouped under the fingertips of one hand'.
really reliable estimate of the age of the Earth and I should
like to salute your work as the means of making it possible.
This letter marks a defining moment in the history of dating
the age of the Earth. A wild miracle had been performed not,
like many of the others, in a blinding flash of revelation, but as
