Telegraph block instrument; London & South Western Railway
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BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
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LicenseTelegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; London & South Western Railway. Preece absolute single-semaphore (lower-quadrant/red) block-indicator 2-position/2-indication (Line Blocked/Line Clear), mounted on a vertical brass-finialled post in a large rectangular thick brass bezel. Above this is an enamel-plate inscribed "Up Line". A bell-dome with striker is mounted in the recessed top of the instrument, below which an extra signal-indication in a semi-circular aperture has been blanked off. A Preece "Off/On" switch-handle commutator and a Preece bell-plunger would accompany this instrument when in service.
