Forgery
1984 Grisewood & Dempsey Ltd
Written by Patricia Grady

GAME NOTES

A clever forger is at work.  He is producing counterfeit copies 
of top-grade copper ingots.  The forgeries contain high 
proportions of cheaper metals such as lead, iron and zinc.

You have just been shipped a consignment of copper ingots which 
includes one forgery.  You can detect it because it will be either 
heavier or lighter than the other ingots.  The aim of the game is 
to find the forgery with as few weighing as possible on your pair 
of scales.

Choose a level of difficulty from 1 (easy) to 8 (difficult).  The 
computer will then display up to 50 copper bars.

You now enter the number of bars you wish to weigh.  If there are 
8 bars in all, for instance, when you see the message "IN LEFT PAN?", 
you might place the first 4 bars in the left-hand pan of the scales 
by entering 1, and then entering 4.  The next 4 bars you would place 
in the right-hand pan by entering 5, and then 8.  To place just 1 bar 
into a pan, enter the number of the bar (number 8 for example) both 
times.

The computer weighs the ingots and shows you the result.  Keep 
weighing the ignots until you think you know which ingot is a forgery; 
then enter N when the computer asks "WOULD YOU LIKE ANOTHER WEIGHING?".

You should then key in the number of the forgery and H if you think it 
is heavier or L if you think it is lighter.  The computer will reveal 
how accurate your detective work has been.