Fowler Calculators was a Manchester company that was founded as the Scientific Publishing Company in 1898 by William Henry Fowler. Besides their range of calculators, they were well known for their range of engineering pocket books that they published annually. Their address was 53 New Bailey Street (1900-9 at least) and their works were later in Hampson Street, Sale. They went into liquidation in 1988.
A Fowler Long Scale Calculator. This is a two sided calculator, 2.7 inches in diameter, with a brown leather case. In the left hand picture, the outer scale is the C scale equivalent, whilst the long scale occupies the inner six rings. There are gauge points around the periphery of the dial which is rotated by the left hand screw whilst the right hand one rotates the movable cursor (there is also a fixed one on the glass). In the right hand picture the scales, from outside to middle are: multiplication & division (short), reciprocal (C1), logs (L), sq roots, log sin, log tan, log sin (small angles). There is no rotating cursor this side.
Fowler Universal Calculator, single sided, 3.4 inches diameter, in a red leather case. Scales from outside in are: short, reciprocal, log, long scale ( 3 rings), Sin, Sin (small angles), Tan. The left hand knob rotates the dial and the right hand one rotates the cursor. There is also a fixed cursor line on the glass. There are gauge points around the dial periphery.
Fowler Magnum Long Scale Calculator, single sided, 4.5 inches in diameter, in a brown leather case. Scales from the outside in are: short, reciprocal, sq root (2 rings), log, long scale (6 rings), sin, sin, tan. There are gauge points around the dial periphery. The left hand knob rotates the dial and the right hand one rotates the cursor.
Fowler Magnum Textile Calculator, single sided, 4.7 inches in diameter, in a black leathercloth covered fitted case with blue velvet lining. Scales from the outside in are: tenths (short), eighths, sixteenths. There is also a part circle inside marked + and -. There are gauge points around the dial periphery which are mostly specific to textile calculations. The left hand knob rotates the dial and the right hand one rotates the cursor. The calculator is complete with a small 42 page booklet of instructions.
Fowler Twelve-Ten Calculator, single sided, 3.4 inches diameter. Scales, from the outside are: short (tenths), reciprocal (tenths), short (twelfths), short (twelfths), sin, sin, tan. There are conversion gauge points around the periphery. The left hand knob rotates the dial and the right hand one rotates the cursor. There is also a fixed cursor line on the glass.
The outer twelfths scale is actually decimally divided with the inner duodecimally divided (e.g. for feet and inches).
This calculator originally had a ring round the upper winder, which has been lost.
The outer twelfths scale is actually decimally divided with the inner duodecimally divided (e.g. for feet and inches).
This calculator originally had a ring round the upper winder, which has been lost.
Fowler Textile Calculator Short Scale Type, single sided, 2.6 inches diameter. The left hand knob rotates the dial and the right hand one rotates the cursor. Scales from the outside in are: tenths, eighths.