[GreenKeys] Lamp bulb in M15 table...

[Kevin DeWitt]

This excerpt comes from an article in Signal Corps Technical Information
Letter No. 26 of January, 1944. It reads "...at ambient temperatures lower
than 40 degrees F, it is recommended that the temperature within the
teletypewriter cover be raised artificially during non operating periods if
possible. This may be accomplished by placing a lighted incandescent bulb
or similar source of heat within the cover..." I seem to recall reading
about a similar practice used in the Pacific (during periods of inactivity)
to reduce the amount of moisture within the cover. I'm not sure I would
want to leave a light bulb screwed into a model 15 for fear of it setting
the customer's house on fire.

Kevin/ww2tty

On Thu, May 25, 2017 at 1:33 PM, Joe Herdler via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> FWIW, I have one of those old model 15s that did service as a TTY for a
> deaf person. It has a lamp with an amber lens that (I assume) would light
> up when the phone modem was activated.
>
> The person who had the machine before me told me that it was in his
> mother's bedroom until the day she passed. Then it stayed behind the stairs
> for years before I obtained it. The "mailbox" case has plenty of room for
> extras like light bulb holders and such.
>
> Best,
>
> Joe
>
>
>
> Consciousness affects the medium. Think happy, be happy, and happiness
> will follow you.
>
>
> ------------------------------
> *From:* Kenneth Gartland <trnsrme at gmail.com>
> *To:* greenkeys <GreenKeys at mailman.qth.net>
> *Sent:* Thursday, May 25, 2017 11:16 AM
> *Subject:* [GreenKeys] Lamp bulb in M15 table...
>
> Hi all!
>
> I'll take an "Educated guess" at this one...
>
> Quite possibly this machine may have seen service
> for the hard of hearing society, they placed many
> surplus'd M15's in homes of the hearing impaired
> or deaf...
>
> I have seen several of these machines equipped with
> similar lamp set up, but as there is no room on a standard
> M15 table, it was usually external...
>
> They​ 15 indicator lamp was turned "On" by an incoming
> call thru the fone modem...
>
> It wud stay on until manually switched off, or the call
> "Cleared"...
>
> In the case of this machine, it, the lamp, was placed
> inside the stand...
>
> It is quite possible the machine had been originally
> installed at or near the head of a set of
> stairs, where it cud be easily seen from below...
>
> Just speculation on my part!
>
> Jordan's theory of the lamp being in the M19 table
> used as a DC ballast lamp makes sense...
>
> The 19' sets used a variety of power supplies
> including the REC13, which cud power a warehouse
> full of tty's!
>
> 73'
>
> Ken
> VE3-HMQ
> i-Telex 61663
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