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Author Topic: Legacy Iambic  (Read 5171 times)
KE6EE
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Posts: 1849




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« Reply #15 on: October 30, 2017, 09:12:17 PM »

There's a very informative article written by Karl, DJ5IL about history of keyers at...  http://www.cq-cq.eu/dj5il_rt007.pdf

Richard, AA4OO

That's a terrific article, full of interesting info and very clearly written.

I really appreciate the reference. Thanks.
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K7KBN
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Posts: 3473




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« Reply #16 on: October 30, 2017, 10:57:51 PM »

The Instructograph is a portable (!) version of the Boehme keyer.  The Navy's Radioman schools used the Boehme units to send code practice to different classrooms at the schools.  Speed was regulated by the size of the friction wheel on the capstan that pulls the tape through the keying contacts (like switching speeds on old reel-to-reel tape recorders).

http://www.virhistory.com/navy/morse/tape-01_small.JPG
« Last Edit: October 30, 2017, 11:07:00 PM by K7KBN » Logged

73
Pat K7KBN
CWO4 USNR Ret.
KE6EE
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Posts: 1849




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« Reply #17 on: October 31, 2017, 10:02:03 PM »

The Instructograph is a portable (!) version of the Boehme keyer.

Yes I think you're right about that Pat. The Boehme keyer being based on slits in a paper roll.

Big mechanical difference, however. Instructograph tape did not have drive perforations mid-tape. Instructographs
were purely mechanical, with a spring motor and a continuously-adjustable speed dial.
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K7KBN
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Posts: 3473




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« Reply #18 on: November 01, 2017, 04:00:24 PM »

The Instructograph is a portable (!) version of the Boehme keyer.

Yes I think you're right about that Pat. The Boehme keyer being based on slits in a paper roll.

Big mechanical difference, however. Instructograph tape did not have drive perforations mid-tape. Instructographs
were purely mechanical, with a spring motor and a continuously-adjustable speed dial.

Yep - solid differences -- so the Instructograph probably wasn't sufficiently expensive for the Government to buy them for training in military skills.  I could never imagine the time that'd be required to keep those motors wound for a large bank of various speeds all running at the same time.  Wonder if "winder's wrist" ever came up as a disability, like "carpal tunnel".  Grin
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Pat K7KBN
CWO4 USNR Ret.
K5LXP
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Posts: 5296


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« Reply #19 on: November 04, 2017, 10:32:52 AM »

I saw that there wasn't a review for the book discussed here, so I posted one:

http://www.eham.net/reviews/detail/13586

Mark K5LXP
Albuqueruqe, NM
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