![](https://coimages.sciencemuseumgroup.org.uk/61/690/large_thumbnail_b000394.jpg)
Block instrument (sending/receiving)
![Block instrument (sending/receiving)](https://coimages.sciencemuseumgroup.org.uk/534/211/small_thumbnail_smg00358078.jpg)
![Block instrument (sending/receiving)](https://coimages.sciencemuseumgroup.org.uk/425/836/small_thumbnail_1994_8771__0004_.jpg)
![Block instrument (sending/receiving)](https://coimages.sciencemuseumgroup.org.uk/423/787/small_thumbnail_1994_8771__0002_.jpg)
![Block instrument (sending/receiving)](https://coimages.sciencemuseumgroup.org.uk/423/788/small_thumbnail_1994_8771__0009_.jpg)
Block instrument; Caledonian Railway. Tyer's 2-needle (Down/Up Line) F-Type 3-position absolute pegging/non-pegging instrument (with internal bell). Has circular, electroplated/brass line-description plate, bakelite-wedge commutator, electroplated bell-plunger (bottom/RHS), and bakelite release-button in circular aperture (middle/RHS).
Details
- Category:
- Signalling & Telecommunications
- Object Number:
- 1994-8771
- type:
- block instrument
- credit:
- British Rail, Clapham