Fowler Calculators

Following his time at Owens College, he became an assistant engineer for the Manchester Steam Users' Association (ca.

That year, The Mechanical Engineer—his weekly journal under the Scientific Publishing Company—published a design for a circular calculator operated by moving fixed pointers over a revolving dial.

[3] Three years later—in 1908—Harold began commercial production of circular calculators in a spare room of the Fowler house in Sale which was converted into a shop.

[3] Harold continued expanding production, aiming to be used in surveying work, construction, and textile manufacturing.

The instruction manual claimed the calculator's size "permits of the use of larger figures and easier reading...Another important feature is that the scales are longer and admit finer graduation.