Ruck machine gun post

James Ruck was the north midlands regional works adviser to the Ministry of Home Security. His principal duties related to the provision of air-raid shelters. In June 1940, he offered the military a design for a machine gun post:

{{blockquote|I propose they be constructed of hollow concrete blocks filled with the earth excavated from the site, roofed with precast concrete beams and paving stone flags; walls 18" thick, spaces being left in each side so that fire can be operated in any direction; a portion of the roof could also be adjustable for firing overhead.}}

{{multiple image

| footer = Ruck machine gun post - construction.

| image1 = Ruck Machine Gun Post - First Operation.jpg

| alt1 = Ruck Machine Gun Post - First Operation

| caption1 = The first operation is to put up arches with gaps where the embrasures will be

| width1 = 207

| image2 = Ruck Machine Gun Post - section through embrasure.jpg

| alt2 = Ruck Machine Gun Post - section through embrasure

| caption2 = Protection built up with concrete paving slabs, mortar and sandbags.

| width2 = 193

}}

Ruck's design was based on precast half-arch concrete sections produced by Hydroprest Concrete Ltd at Scunthorpe. Four {{convert|12|in|cm|adj=on|sigfig=3}} sections formed an arch with inside dimensions {{convert|5|ft|m|abbr=on}} wide, {{convert|7|ft|m|abbr=on}} high and {{convert|2|ft|cm|abbr=on}} long. Any number of the arches could be assembled together to form a structure of a desired length, but for Ruck's design 20-inch gaps between the arches would be left to serve as embrasures, with an inside length of {{convert|12|ft|m|abbr=on}}. The arches were clad with two layers of mortar and concrete paving slabs; this filled in the gaps except where an embrasure was required and gave a wall thickness that varied between {{convert|6|and|9|in|cm}}. The ends were walled up with hollow concrete blocks filled with bricks; the wall at one end had an embrasure, the other end had an entrance. The concrete offered only limited protection, so the structure would be partly buried and then surrounded by an outer wall of sandbags to the level of the embrasures and the gap between the wall and the concrete filled with rammed earth.

According to Ruck, who enthusiastically promoted his design, the principal advantages of the machine gun post were that it could be quickly constructed by unskilled labour and made economical use of materials. The precast components could be produced at the rate of 70 posts per day and Ruck claimed that six unskilled men could complete three precast units in a day. Ruck also emphasised that his design made use of "some hundreds of thousands of tons of this material lying in stocks in makers yards throughout the country requiring no fresh drain on cement or steel". Ruck estimated the cost of a post to be just £40 [equivalent to £{{Formatnum:{{Inflation|UK|40|1940|r=-2}}}} in {{CURRENTISOYEAR}}{{Inflation-fn|UK|df=y}}].

{{multiple image

| footer = Ruck machine gun post.

| image1 = Ruck Machine Gun Post, interior.jpg

| alt1 = Ruck Machine Gun Post, interior

| caption1 = Interior, showing end wall.

| width1 = 200

| image2 = File-Ruck Machine Gun Post, horizontal embrassure.jpg

| alt2 = File-Ruck Machine Gun Post, horizontal embrassure

| caption2 = Horizontal embrassure

| width2 = 200

}}

File:The ruined Chapel at Cottam (geograph 3930981).jpg

In July 1940, instructions were issued for the order of 1,600 posts, by September 1940 some 4,000 posts had been constructed and there were orders for a further 2,000.

Today, the Ruck machine gun post presents something of a mystery. Despite the substantial numbers constructed, traces of them are rare – just 5 were recorded by the Defence of Britain project.{{cite web

| url = http://ads.ahds.ac.uk/catalogue/specColl/dob/overview.cfm

| title = Overview

| work = Defence of Britain database

| accessdate = 8 January 2014}} Of all the pillbox designs, the Ruck machine gun post is one of the most readily disassembled and this may have been the fate of many of these posts. Because the post had to be partially buried, it was best employed on rising ground; it may be that many were deployed in soft cliffs and dunes along an ever-changing coastline and have been lost to erosion.{{cite web|url=http://www.pillboxwalks.co.uk/page12.htm|title=North Yorkshire|accessdate=17 January 2016|work=Pillbox Walks|url-status=dead|archiveurl=https://web.archive.org/web/20160303173152/http://www.pillboxwalks.co.uk/page12.htm|archivedate=3 March 2016}} Finally, there may be extant examples that are simply unrecognised for what they are.

{{commons category|Ruck machine gun post}}

• British anti-invasion preparations of World War II
• British hardened field defences of World War II

{{reflist}}

• {{cite book

| last = Foot

| year = 2006

| first = William

| title = Beaches, fields, streets, and hills ... the anti-invasion landscapes of England, 1940

| publisher = Council for British Archaeology

| isbn = 1-902771-53-2

}}

• {{cite web

| url = http://www.nationalarchives.gov.uk

| title = The National Archives

| accessdate = 2 August 2010

| work = Repository of UK government records

}}

• {{cite web

| url = https://www.flickr.com/photos/27124479@N05/2818879180/in/photostream/

| title = Ruck/Stanton shelter, Reighton Sands, Yorkshire

| accessdate = 24 September 2010

| work = flickr

| date = 10 August 2008

}}

{{Use British English|date=October 2010}}

Category:World War II military equipment of the United Kingdom

Category:20th-century forts in England