<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div class="WaaZC" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"><div class="RJPOee EIJn2" style="animation: 0s !important;"><div class="rPeykc" data-hveid="CAMQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQo_EKegQIAxAB" style="margin: 0px 0px 20px; hyphens: auto;">From Google AI </div><div class="rPeykc" data-hveid="CAMQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQo_EKegQIAxAB" style="margin: 0px 0px 20px; hyphens: auto;">Telegrapher's paralysis, also known as glass arm, was <mark class="QVRyCf" style="background: var(--m3c22); border-radius: 4px; padding: 0px 2px;">a repetitive stress injury (RSI) that affected telegraphers in the early days of telegraphy</mark>. It was caused by the forceful up-and-down motion of conventional telegraph keys.<span class="UV3uM" style="white-space: nowrap;"> <div data-cid="6d3e49d1-1af9-46ec-b35d-7d5fe4c87098" class="NPrrbc" style="margin-right: 6px; display: inline-flex; vertical-align: middle;"><div jsname="HtgYJd" class="BMebGe btku5b fCrZyc LwdV0e FR7ZSc OJeuxf" jsaction="click:trigger.YbaXcb;" aria-label="View related links" role="button" tabindex="0" data-hveid="CAcQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQ3fYKegQIBxAB" style="-webkit-tap-highlight-color: transparent; display: inline-block; vertical-align: middle; cursor: pointer; outline: 0px;"><div class="niO4u" style="display: flex; justify-content: center; position: relative; align-items: stretch; width: 28px; outline: 1px solid var(--Yi4Nb); border-radius: 9999px; margin: 0px auto; outline-offset: -1px; height: 20px; min-height: 20px;"><div class="kHtcsd" style="display: flex; align-items: center; justify-content: center; width: 28px; border-radius: 9999px; height: 20px;"><span class="d3o3Ad gJdC8e Hkv2Pe" style="color: rgb(11, 87, 208); display: flex; align-items: center; margin: 0px; background: unset !important;"><span class="iPjmzb Sorfoc gNGSDf" style="display: flex; height: unset; rotate: 135deg;"><span class="z1asCe Sb7k4e" style="display: inline-block; fill: currentcolor; height: 18px; line-height: 18px; position: relative; width: 18px;"><svg focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></span></span></div></div></div></div></span><div jscontroller="g4PEk" jsdata="ZtRa8d;_;CYAikI" jsaction="rcuQ6b:npT2md"></div></div></div></div><div class="WaaZC" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"><div class="RJPOee EIJn2" style="animation: 0s !important;"><div class="rPeykc" data-hveid="CAwQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQo_EKegQIDBAB" style="margin: 10px 0px 20px;">Symptoms of telegrapher's paralysis included: Pain, Numbness, Tingling in the arm and wrist, and Paralysis of the fingers.<span class="UV3uM" style="white-space: nowrap;"> <div data-cid="98a6a797-0e25-4449-b567-4775730535e3" class="NPrrbc" style="margin-right: 6px; display: inline-flex; vertical-align: middle;"><div jsname="HtgYJd" class="BMebGe btku5b fCrZyc LwdV0e FR7ZSc OJeuxf" jsaction="click:trigger.YbaXcb;" aria-label="View related links" role="button" tabindex="0" data-hveid="CA4QAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQ3fYKegQIDhAB" style="-webkit-tap-highlight-color: transparent; display: inline-block; vertical-align: middle; cursor: pointer; outline: 0px;"><div class="niO4u" style="display: flex; justify-content: center; position: relative; align-items: stretch; width: 28px; outline: 1px solid var(--Yi4Nb); border-radius: 9999px; margin: 0px auto; outline-offset: -1px; height: 20px; min-height: 20px;"><div class="kHtcsd" style="display: flex; align-items: center; justify-content: center; width: 28px; border-radius: 9999px; height: 20px;"><span class="d3o3Ad gJdC8e Hkv2Pe" style="color: rgb(11, 87, 208); display: flex; align-items: center; margin: 0px; background: unset !important;"><span class="iPjmzb Sorfoc gNGSDf" style="display: flex; height: unset; rotate: 135deg;"><span class="z1asCe Sb7k4e" style="display: inline-block; fill: currentcolor; height: 18px; line-height: 18px; position: relative; width: 18px;"><svg focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></span></span></div></div></div></div></span><div jscontroller="g4PEk" jsdata="ZtRa8d;_;CYAiko" jsaction="rcuQ6b:npT2md"></div></div></div></div><div id="_4x1TZ5CwM4Wf5NoP94fsmQQ_19" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"></div><div class="WaaZC" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"><div class="RJPOee EIJn2" style="animation: 0s !important;"><div class="rPeykc" data-hveid="CBIQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQo_EKegQIEhAB" style="margin: 10px 0px 20px;">To help telegraphers with telegrapher's paralysis, keys were built to allow for side-to-side motion instead of up-and-down. The side play of the straight key could also be increased by loosening the adjustable trunnion screws.<span class="UV3uM" style="white-space: nowrap;"> <div data-cid="b445b1ec-3377-4fd8-9b75-f0b05e2dea99" class="NPrrbc" style="margin-right: 6px; display: inline-flex; vertical-align: middle;"><div jsname="HtgYJd" class="BMebGe btku5b fCrZyc LwdV0e FR7ZSc OJeuxf" jsaction="click:trigger.YbaXcb;" aria-label="View related links" role="button" tabindex="0" data-hveid="CBQQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQ3fYKegQIFBAB" style="-webkit-tap-highlight-color: transparent; display: inline-block; vertical-align: middle; cursor: pointer; outline: 0px;"><div class="niO4u" style="display: flex; justify-content: center; position: relative; align-items: stretch; width: 28px; outline: 1px solid var(--Yi4Nb); border-radius: 9999px; margin: 0px auto; outline-offset: -1px; height: 20px; min-height: 20px;"><div class="kHtcsd" style="display: flex; align-items: center; justify-content: center; width: 28px; border-radius: 9999px; height: 20px;"><span class="d3o3Ad gJdC8e Hkv2Pe" style="color: rgb(11, 87, 208); display: flex; align-items: center; margin: 0px; background: unset !important;"><span class="iPjmzb Sorfoc gNGSDf" style="display: flex; height: unset; rotate: 135deg;"><span class="z1asCe Sb7k4e" style="display: inline-block; fill: currentcolor; height: 18px; line-height: 18px; position: relative; width: 18px;"><svg focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></span></span></div></div></div></div></span><div jscontroller="g4PEk" jsdata="ZtRa8d;_;CYAik0" jsaction="rcuQ6b:npT2md"></div></div></div></div><div id="_4x1TZ5CwM4Wf5NoP94fsmQQ_22" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"></div><div class="WaaZC" style="caret-color: rgb(0, 29, 53); color: rgb(0, 29, 53); font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 20.16px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); -webkit-text-size-adjust: 112%;"><div class="RJPOee EIJn2" style="animation: 0s !important;"><div class="rPeykc" data-hveid="CBkQAQ" data-ved="2ahUKEwjQrdeWwJOKAxWFD1kFHfcDO0MQo_EKegQIGRAB" style="margin: 10px 0px 20px;">Telegrapher's paralysis is an example of a class of paralyses that are caused by the repetitive use of a particular set of muscles in the same way over a long period of time. Other examples of this include writer's paralysis and hammer paralysis.<span class="UV3uM" style="white-space: nowrap;"> </span></div></div></div><div dir="ltr">Sent from my digital telegraph key<div>Jim Stapleton</div></div><div dir="ltr"><br>On Dec 6, 2024, at 09:57, NW Mailing List via NW-Mailing-List <nw-mailing-list@nwhs.org> wrote:<br><br></div><div dir="ltr"><span>The August, 1925 edition of the N&W magazine has an article called “Telegraph and Telephones on the N&W”. That article contains a paragraph about “the bug” that saved operators from giving up their work due to telegraphers paralysis. </span><br><span></span><br><span>What was telegraphers paralysis? And I’d like to know more about the other improvements noted in the paragraph. See attached. There’s nothing quite as curiosity-piquing as reading about contemporary technology - 100 years after the fact!</span><br><span></span><br><span>Thanks</span><br><span>Matt Goodman</span><br><span>Columbus Ohio</span><br><span></span><br><div><IMG_4378.jpg></div><span></span><br><span>Matt Goodman</span><br><span>Columbus, Ohio</span><br><span></span><br><span>Sent from my mobile<span>________________________________________</span><br><span>NW-Mailing-List@nwhs.org</span><br><span>To change your subscription go to</span><br><span>http://list.nwhs.org/mailman/options/nw-mailing-list</span><br><span>Browse the NW-Mailing-List archives at</span><br><span>http://list.nwhs.org/pipermail/nw-mailing-list/</span><br></span></div></body></html>