Elevation Receiver

An 'Elevation Receiver' is a F.T.P. instrument mounted near a gunlayer position which receives and indicates (usually by 2 red pointers for degrees and minutes) an angle of elevation transmitted by a director. The gunlayer works his controls to elevate the gun and bring the black pointers into alignment with the red.

An elevation receiver was required near each gun which would be fired under control of a director which controlled elevation (German directors did not). Similarly, each trainable mounting required a training receiver to guide its trainer in matching the director.

Various Examples

British

British elevation receivers were provided indication of the desired elevation angle (quantized to nearest ? arc minutes) which was corrected for:

• tilt to negate imperfection in the mounting's vertical installation.
• Dip (differences in mounting height relative to the ship's datum point).
• the muzzle velocity in the particular gun, subject to its accumulated number of firings.
• use of alternate projectiles or reduced charges.

The British Director Firing Handbook from 1917 documents the following types:

• Turret Type
• 6-in P. VIII Type (this one had just a single red and a single black pointer)
• 6-in P. VII Type
• 4-in Triple Type
• 6-in P. XIII Type

Much to my surprise, I see that the director system used in destroyers and flotilla leaders did not transmit elevation to the guns at all, and so they lacked elevation receivers.

German

The German director system did not transmit elevation to the guns; the guns were locally laid and fired even under director control. Consequently, there was likely no such thing as a German elevation receiver in active service.

See Also

• Elevation Transmitter
• Training Receiver

Bibliography

• Template:BibHMSODirectorFiringHandbook1917
• Template:BibHMSODirectorFiringForDestroyers1918
• Template:BibUKGunneryPocketBook1945