In article ,
Alan Braggins wrote:
On 2016-08-16, Dave Plowman (News) wrote:
Alan Braggins wrote:
http://www.sheldonbrown.com/dynohubs.html has a illustration of that
from a 1952 Sturmey Archer catalogue, and also describes use of a
bridge rectifier to charge NiCds from a dynamo, the battery also
acting as regulation for the dynamo output.

Think that's wrong. The rectifier acted as a one way valve to prevent
the batteries discharging into the alternator when stopped. The
batteries were dry cells.
[...]
I don't think Ni-Cads were around in 1952 - at least at a price a
cyclist would pay for.

The 1952 illustration is labelled "Dry battery unit". The use of "a 6
volt (5 x 1.2v cell) nickel cadmium battery", also described on the same
page, is not from 1952.

Ah. Certainly when I was into bicycles in the 50s, the cells used were
primaries. And the auto switching (which used a rectifier) exclusive to
Raleigh. As I rather fancied the same idea on my Philips. But it is a long
long time ago.

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*IF ONE SYNCHRONIZED SWIMMER DROWNS, DO THE REST DROWN TOO?

Dave Plowman London SW
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