Calculating . . . Adding Machines and Other Mathematical Aids
Sections
Museum Hold Tight! Photos
Walking Weather
Acorn Commodore Sinclair PCN
Calculating
Calculating
Introduction
In The Hand
Addiator
Addmaster
Arithma
Decimeter
Exactus
Reckoner
Addipresto
Bri Cal
Brunsviga
Contex A
Contex B
Olivetti 15 £sd
Olivetti 20 £sd
Olivetti Decimal
Plus
Victor
 
For an explanation of £sd money
see the Money page
 
Images in these pages are not necessarily to the same scale
 
 
  In The Hand
Addiator
Addiator
£sd
Addmaster Junior
Addmaster
£sd
ArithmaSterling
Arithma
£sd / Decimal
Decimeter
Exactus
Ready Reckoner
Reckoner
£sd
 
  On The Desk
Addipresto
Addipresto
£sd / Decimal
Bri Cal
Bri Cal
£sd
Brunsviga
Brunsviga
£sd
Contex A
Contex A
£sd
Contex B
Contex B
£sd
Olivetti (£sd)
Olivetti 15
£sd
 
Olivetti (£sd)
Olivetti 20
£sd
Olivetti (Decimal)
Olivetti 20
Decimal
Plus
Plus
£sd
Plus
Victor
£sd
 
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Contents
Click an image above or a link below for details
In The Hand
Addiator A hand-held or desktop calculator for adding and subtracting in old sterling.
Addmaster A hand-held calculator for adding and subtracting in old sterling.
Arithma A hand-held calculator for adding and subtracting in old sterling.
Decimeter A converter between old and new sterling currencies.
Exactus A hand-held calculator for adding and subtracting in old sterling.
Reckoner A ready reckoner for old sterling.
On The Desk
Addipresto A desktop calculator for adding in old sterling.
An early desktop calculator for adding in old sterling.
A desktop calculator for adding and subtracting in old sterling.
Contex A A desktop calculator for adding in old sterling.
Contex B A more modern looking desktop calculator for adding in old sterling.
Olivetti 15 £sd An early desktop add-lister for adding and subtracting in old sterling.
Olivetti 20 £sd A desktop add-lister for adding and subtracting in old sterling, convertible to decimal.
Olivetti Decimal A desktop add-lister for adding and subtracting in new sterling.
Plus A computator style adding machine for old sterling.
Victor A desktop add-lister for adding and subtracting in old sterling.
And
Money The old pounds, shillings and pence described, with examples.
 
Adding machines were around for a long time in the days before electronic calculators.
Adding up in the old UK currency of pounds, shillings and pence required special adaptations.
Of course you could use a ready reckoner and look the answer up in the tables or there was always pencil and paper . . . .
To see my Commodore electronic calculators, click here.   First Item >>
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