{"id":621,"date":"2025-03-28T22:21:59","date_gmt":"2025-03-28T21:21:59","guid":{"rendered":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/?page_id=621"},"modified":"2025-04-17T17:34:44","modified_gmt":"2025-04-17T15:34:44","slug":"technical-informations","status":"publish","type":"page","link":"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/index.php\/m-138\/technical-informations\/","title":{"rendered":"Technical Informations"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Appearance and dimensions<\/strong><\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<h3 class=\"wp-block-heading\"><span style=\"text-decoration: underline;\">M-138<\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The base is a flat aluminium board which measures 16&#8243; x 11&#8243; (40.64cm x 27.94cm).<\/li>\n\n\n\n<li>Cylindrical rods, 1\/8&#8243; (3.2mm) in diameter, separate the board in 25 horizontal channels.<\/li>\n\n\n\n<li>The rods are spaced 5\/8&#8243;(1.6cm) apart and are fixed with 4 rivets each. Every fifth is black, starting with the topmost rod.<\/li>\n\n\n\n<li>A ruler, attached to a rod fixed at the bottom edge, slides from side to side.<\/li>\n\n\n\n<li>Two bars are fixed on the left and right edge, atop the rods so the paper strips can slide under.<\/li>\n\n\n\n<li>The back side features rubber feet, and a support so the device can stand at a 45\u00b0 inclination.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1676\" height=\"1155\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198.png\" alt=\"\" class=\"wp-image-600\" style=\"width:300px\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198.png 1676w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198-300x207.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198-1024x706.png 1024w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198-768x529.png 768w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m-138-e1743195192198-1536x1059.png 1536w\" sizes=\"auto, (max-width: 1676px) 100vw, 1676px\" \/><figcaption class=\"wp-element-caption\"><em>M-138 cipher device &#8211; National Cryptologic Museum<\/em><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1410\" height=\"1052\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138-back2.png\" alt=\"\" class=\"wp-image-627\" style=\"width:300px\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138-back2.png 1410w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138-back2-300x224.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138-back2-1024x764.png 1024w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138-back2-768x573.png 768w\" sizes=\"auto, (max-width: 1410px) 100vw, 1410px\" \/><figcaption class=\"wp-element-caption\"><em>M-138 cipher device (back) &#8211; National Cryptologic Museum<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading alignwide\"><span style=\"text-decoration: underline;\">M-138-A<\/span><\/h3>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<ul class=\"wp-block-list\">\n<li>The device has an hinged aluminium base, 14 5\/8&#8243; x 15 11\/16&#8243; (37.14cm x 39.84cm) unfolded, weighing about 2kg.<\/li>\n\n\n\n<li>The base has 30 milled channels.<\/li>\n\n\n\n<li>&#8220;CLEAR TEXT&#8221; is written above the first and last (53<sup>rd<\/sup>) columns, and &#8220;DO NOT COPY&#8221; above the center (27<sup>th<\/sup>) column <\/li>\n\n\n\n<li>A vertical line appears above and below each odd column, and a dot above and below even columns.<\/li>\n\n\n\n<li>An hinged ruler can slide along a groove at the bottom of the base. It is 1\/2&#8243; wide and removable.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"772\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-5-1024x772.png\" alt=\"\" class=\"wp-image-636\" style=\"width:auto;height:300px\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-5-1024x772.png 1024w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-5-300x226.png 300w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-5-768x579.png 768w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-5.png 1194w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>M-138-A device &#8211; National Cryptologic Museum<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"994\" height=\"1024\" src=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-closed-994x1024.png\" alt=\"\" class=\"wp-image-629\" style=\"width:auto;height:300px\" srcset=\"http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-closed-994x1024.png 994w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-closed-291x300.png 291w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-closed-768x791.png 768w, http:\/\/sfisqlu.cluster100.hosting.ovh.net\/wp-content\/uploads\/2025\/03\/m138a-closed.png 1109w\" sizes=\"auto, (max-width: 994px) 100vw, 994px\" \/><figcaption class=\"wp-element-caption\"><em>M-138-A device, closed &#8211; National Cryptologic Museum<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Appearance and dimensions M-138 M-138-A<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":582,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-m-138","meta":{"footnotes":""},"class_list":["post-621","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M-138 | Technical Informations<\/title>\n<meta name=\"description\" content=\"M-138: The base is a flat aluminium board, separated in 25 channels by cylindrical rods. 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