Tom Perera - W1TP

These are the latest Corrections For:
"Perera's Telegraph Collector's Guide" (First edition).

Unfortunately, no matter how hard I tried to make it "perfect", some errors and problems remained in the final product. Hopefully you will email corrections to me and I will be able to incorporate all of them into future editions.

The biggest disappointment was with the photos. Much of the fine detail was lost in the printing process... especially where there are large areas of black... The SECOND EDITION uses a different printing shop and I have reduced the contrast dramatically before submitting the pictures to the printer.

Another change that I made in the SECOND EDITION was to include pictures of a typical "key", "register", "sounder", and "relay" in the historical introduction to help people who are totally unfamiliar with telegraph equipment. I was forced to leave these pictures out because of the 80 page limitation.

Another change in the SECOND EDITION is the inclusion of a detailed and cross-referenced 1500-item index which allows readers to find anything in the book with a minimum of time and effort. Again, the 80 page limit of the first edition forced me to leave out this important section.

The new printer allowed me to go to a full 100 pages and I was able to include a lot more helpful information. What else would YOU like to see included in future editions ?? For instance, do I need to include a list of the dot-dash equivalents of letters in the Morse and International codes?

Here are the detailed corrections:

Revision Date:02-24-2001
Number of corrections: 35


1 and 8             There are now over 900 items in my internet
                    Telegraph Museums

9       70          Typo: witha -> with a 

11      120         diplex should read: duplex
                    Also: Polechanger keys were used to switch
                    the polarities from positive to negative
                    for the duplex and quadruplex lines.

15      176         diplex should read duplex.

16      192         I should have emphasized how very important
                    the "toy" telegraph sets and inexpensive
                    Bunnell KOBs were in getting young people
                    interested in careers in telegraph.

16      194a        Teleplex also made a similar device.

17      200         Typo: TheAutoplex --> The Autoplex

18      212         The round-shaft "X" was also called the 
                    "Improved" model.

18      220         The internet image in my internet museum is
                    incorrectly listed at the end of the Guide
                    on page 78 as 7000. Actually, the
                    Vertical Vibroplex is shown in my museum as 6265.

25      294         The rotating frame Dow was also called
                    The "Universal" Model.

27      1st. Para   Should read: high current primary &  
                    high voltage secondary.

27      2nd. Para   Since there were over 100,000 licensed 
                    stations before WW-I, the scarcity of 
                    spark keys is a mystery.

29      428         This is NOT a flameproof key.
                    (The contacts are not enclosed.)

29      428         This is NOT similar to item 424.

29      432         This is a German Spark Key.

30      436         This is a Wireless key not a Spark Key.

30      438         This is a solid brass key with 1-1/2" contacts.

30      440         This is not similar to # 438.
                    It is British Admiralty pattern 7681.
                    The high knob indicates that it had a pressed
                    steel cover.

33      502         A cover in good condition adds 
                    significantly (20%+) to the value of this key.

33      520         ( 937 - 1984 ) should read ( 1937 - 1984)

43      660         The photo actually shows a CMI26003A key
                    which was made by the Moulded Insulator Co.

44      692         This key was actually manufactured in 1977.
                    It is marked: MIL-C-24174/3-001 and made by

49      770         Change description to:  Aircraft light blinker
                    key: used to blink the lights on British and
                    Canadian aircraft for plane-to-plane
                    communications during periods of radio silence.
                    There were metal (like this one) and bakelite versions.
50      810-814     Change all references to JUNKERS (Who made
                    airplanes) to JUNKER, the telegraph key 
                    manufacturer of Bonn, Germany.

51      818         Change xxx-26003A to Cxx-26003A

51      824         The Baumuster key is also called the "T-1" key.

55      971         Manufactured by the Henry Rousseau Co.

76                  PERIODICALS:
                    The KEYLETTER:
                    Published by Lynn Burlingame - N7CFO
                    Internet web pages:
                    Address: 15621 S.E. 26th St. Bellevue, WA 98008
                    $10 contribution / year. $25 for all back issues!

77                  Internet Links: add:
           - The Vibroplex Co.

77                  Internet Links: add:
                    (Tom French--W1IMQ / Artifax Books homepage.)

77                  Internet Links: add:
                    (Lynn Burlingame - N7CFO, the "Keyletter"

77                  Internet Links: Antique Wireless Assoc. corrected:

77                  Internet Links: NJ Antique Radio Club corrected:

77                  Internet Links: Russ Kleinman corrected:

78-79               The prices in this list represent the prices
                    that an 'AVERAGE' collector would pay for an item.
                    Internet auctions with their huge bidder base
                    often bring much higher prices.
                    HOWEVER, the RELATIVE prices remain the same.
                    (That is: a low value key will remain
                    proportionally lower in value than a high
                    value key even though the overall values
                    may shift upward in internet auctions.)


Professor Tom Perera
Montclair State University

Internet On-Line Telegraph & Scientific Instrument Museum:
Internet ENIGMA Museum: