The Ross Precision Computer
I have been looking to acquire a Ross Precision Computer for many decades now. The Ross was conceived and manufactured in San Francisco, CA in starting in about 1915 by Louis Ross, a Ukrainian immigrant to the US. These are considered very rare, as the company was only in business for a limited number of years, they were relatively expensive when they were originally offered for sale, and not many have survived. On the plus side, they were very accurate (5 places of accuracy), and is less bulky, and could be carried easier (length, 11.5") than some of the other long scale slide rules like the Thacher, or the Fuller.
I have recently purchased the Ross pictured above and added it to my collection. For a more descriptive article on the details of this device, please see this link by Nathan Zeldes.
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