I can't see how that would work.As a mere skimmer, may I suggest they could be used for taking on fresh water/fuel.
As above, I can't see how that would work for either or why you would need to remotely operate the gun or the planes. They look like smaller versions of the engine room telegraphs we had on the Rusty B, which is why I agree with janners hypothesis.Alternatively:
a. Remote layer & trainer for the foredeck gun,
or
b. Remote foreplanes & after planes controls for running 'shallow' or trimmed down.
Thanks, @janner. I did one trip on an 'O' boat as a passenger in the very early 80's and can't remember (if I ever knew) about the telegraphs. I did, however, find a combined telegraph for sale on ebay for £1950 this morning.Just had a email back from Eric Andrews, He was Scratcher on the Sidon (same class of Boat for those that don't know) in his opinion they are the engine room telegraphs. Huw, I don't remember Diesel Boats having the Rev counters/indicators.
I'm sure on O boats we used to have standard revs that we would set for slow and half. The rev order indicator came later I seem to remember. For example, when in the motor room and receiving the order 'half ahead' we used to adjust the revs to what ever half ahead was in the relevant group. Group up 250, Group down 160 (can't recall the actual figures but somebody will be along to correct me in due course hopefully!)@WreckerL, I think you and Janner are probably right, but I'm puzzled by one thing. RN practice (and that of, for example, Cunard) was to have 2 telegraphs per shaft, one for power and direction (slow, half, full ahead/astern) and one for the number of revolutions. I can't make out a revolutions telegraph for either shaft in the photo.
The seller is also selling this:Thanks, @janner. I did one trip on an 'O' boat as a passenger in the very early 80's and can't remember (if I ever knew) about the telegraphs. I did, however, find a combined telegraph for sale on ebay for £1950 this morning.
https://www.ebay.co.uk/itm/Bronze-Ships-Engine-Revolution-Telegraph-by-Chadburn/301081456164?hash=item4619da6e24:g:IDMAAOxy79JRicIH
The seller is apparently in Pompey Dockyard
I guess the letter belongs to the decedents of Richard Oglesby, to whom it was addressedThe seller is also selling this:
https://www.ebay.co.uk/itm/Framed-Letter-By-Lord-Nelson-Signed-And-Dated-1805/292324109967?_trkparms=aid=555018&algo=PL.SIM&ao=2&asc=43781&meid=37bc0ee3ad634e3a9644d9f41aa6f654&pid=100005&rk=3&rkt=6&sd=272810791815&itm=292324109967&_trksid=p2047675.c100005.m1851
Why is this allowed? Surely that is a historical document and therefore should belong to the nation?
On an Oberon, slow ahead was determined by 'full field' (35 amps) and full ahead was determined by maximum armature current (1650 amps) so the revs obtained at slow or full ahead in any Group was dependent on the state of the battery charge. As Polto states, for half ahead there were standard revs.I'm sure on O boats we used to have standard revs that we would set for slow and half. The rev order indicator came later I seem to remember. For example, when in the motor room and receiving the order 'half ahead' we used to adjust the revs to what ever half ahead was in the relevant group. Group up 250, Group down 160 (can't recall the actual figures but somebody will be along to correct me in due course hopefully!)
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