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'Standard' Calculator
(front) |
'Standard' Calculator
(back). The indistinct text at the bottom reads:
Times given are local solar time which may not be official time
and must be converted. For example, in England, 3pm
= 3pm Greenwich Mean Time (GMT) = 4pm British Summer Time (BST)
= 5pm Double Summer Time (DST) |
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'Standard' Calculator
(front - Souther hemisphere) - (RH) |
'Standard' Calculator
(back - note "Latitude S" on LHS)
Also, there is no guidance about GMT, BST or DST. - (RH) |
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Artificial Light
Calculator |
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'Artificial Light'
Calculator (front) |
'Artificial Light'
Calculator (back) |
The calculators, when
purchased individually, were supplied in small paper envelopes,
such as the one shown above, 7.5cm square.
The 3/- (3shillings,
3s, = 15p) price is clearly marked.
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BJPA
Review of the Artificial Light Calculator, July 1949, p305 |
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