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In 1920, Treasury gold certificate notes were issued in denominations of £1, £5, £100, £1,000 and £10,000, in Afrikaans and English script. From 1921, the South African Reserve Bank took over the issuance of paper money, introducing notes for 10/–, £1, £5, £20 and £100. £20 notes were last issued in 1933, with £10 notes added in 1943.
In addition, two bullion coins with denominations of 1 rand and 2 rand were issued, replacing the gold half-pound and pound coins introduced in 1952. Both the pound and the rand gold coins matched the specifications of the British half-sovereign and sovereign (minted, among others, at the Pretoria branch mint until 1932), including the gold ...
There were also contemporary jewellers' copies struck at the same time. The jewellers' copies are also in 22 carat (92%) gold, but they can be identified by the lack of stops in the Z.A.R. monogram at the top of the reverse. The jewellers' copies of the Sammie Marks Tickey are popular with Commonwealth of Nations coin collectors.
All of the logic functions of a calculator had been squeezed into the first "calculator on a chip" integrated circuits (ICs) in 1971, but this was leading edge technology of the time and yields were low and costs were high. Many calculators continued to use two or more ICs, especially the scientific and the programmable ones, into the late 1970s.
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It replaced the South African pound as legal tender, at the rate of 2 rand to 1 pound, or 10 shillings to the rand. The government introduced a mascot, Decimal Dan, "the rand-cent man" (known in Afrikaans as Daan Desimaal). [4] This was accompanied by a radio jingle to inform the public about the new currency. [5]
The comptometer-type calculator was the first machine to receive an all-electronic calculator engine in 1961 (the ANITA mark VII released by Sumlock comptometer of the UK). In 1890 W. T. Odhner got the rights to manufacture his calculator back from Königsberger & C , which had held them since it was first patented in 1878, but had not really ...
The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...