First 'pocket sized calculator' in Bonhams auction
A number of historic scientific instuments will be up for grabs in an upcoming Bonhams auction-including the first pocket sized mechanical calculator.
The calculator is among the 141 lots hitting the auction block on the 19th of May. The sale will also offer a combined tellurium and planetarium from early 19th century England an ivory anatomical model of a pregnant woman from the 17th century and a collection of ocular prosthesis from late 19th century.
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