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Gradient measurements



What is the conversion formula for our 1 in x form of gradient measurements
to the percentage system?
Also, conversion to degrees?

I thought 50% was 1 in 1 or 45 deg., but have just been viewing a funicular
with a 100% gradient - it doesn't look vertical!
http://freedom.dicea.unifi.it/pub/funimag/chatelot01.htm if you're
interested.

Thanks in advance, & thanks to all those who responded to my enquiry about
steep gradients.

David Martin
Blue Mountains Railway Pages
http://www.mountains.net.au/plaza/rail/