[GreenKeys] Lamp bulb in M15 table...

Sat May 27 10:27:14 EDT 2017

Well, to keep a certain minimum temperature under the cover does make sense.
During the winter months (in other words, not long ago) I restored a WU 2-B tape printer. It gets pretty cold during the night hours - even here in the south. Inside my workshop, it was as cold as outside. Took about an hour to get the temperature up inside the shop using a little space heater.
During that hour, the printer was not performing well and only garbage came out. It was a big head scratcher to me until I discovered the temperature problem.
From that point on, I kept all the lights on in my shop over night to keep the temperature around 40 degree.
So, it really does make sense to have a very small bulb (maybe 15W) under the hood.

Nick  -  N0NCQ

Sent from my T-Mobile 4G LTE Device

-------- Original message --------
From: Kevin DeWitt <kevin.dewitt at gmail.com>
Date: 5/27/17 10:00 AM (GMT-05:00)
To: Joe Herdler <joe.herdler at yahoo.com>
Cc: greenkeys <GreenKeys at mailman.qth.net>
Subject: Re: [GreenKeys] Lamp bulb in M15 table...

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<mailto: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<mailto:trnsrme at gmail.com>>
To: greenkeys <GreenKeys at mailman.qth.net<mailto: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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