A method to multiply or divide any number of figures by a like or a less number, so expeditely, that any fifty figures may either be multiplied or divided by any fifty figures, all in one line, in five minutes time. ... Invented by Quin Mackenzie-Quin, ...
Quin, Quin Mackenzie.
London : printed for the author,
1750.
With a list of subscribers.
ESTC