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Model Railroader Magazine 1939 March Three position semaphore signal
Model Railroader 1939 March
Table of Contents.
Three-Position Signal 117
To Kill an Organization 122
Baltimore & Ohio Valley RR. _123
Construction Kinks 126
Realistic Operation
(Boomer Pete) 127
Spring Switches 130
Load for Depressed Center Car _131
Largest Model Railroad 136
Locomotive Plans 138
Handling Models 143
How Many Cars? 146
The 0-4-0 Mallet 148
Railway Postoffice 150
News 152
Trade Topics 160
Three-Position Signal
A Semaphore Which Automatically Throws to All Indications.
BY FRANK TAYLOR.
[This is another project worked out in the experimental department of this magazine. We are continually striving to originate new ideas that will make the hobby more interesting to you. Suggestions for future projects will be appreciated.-Editor.]
THE somewhat outmoded semaphore blade used for block and interlocking signals has one or two outstanding features that adapt it to model railroad practice. To know what the signal indication is without having to look at the face of it is very desirable and in addition the motion of the blades is something a person enjoys watching.
As the majority of the installations in recent years have been of the three-position upper quadrant type, one of the most typical is modeled. The big bugaboo in modeling this type of signal has been to get the blade to function in three positions. When the blade is normally vertical the indication is clear, when the blade is at an upward angle of 45the indication is proceed prepared to stop at next signal, and when the blade is horizontal the indication is stop. To have the blade behave in a railroadlike manner two solenoids are arranged to supply the necessary impetus to the blade at the proper time. In addition, three lenses-red, yellow and green -are installed in the positions shown. These are illuminated in turn as the blade indicates, by means of a beam of light which is projected upward from below the table. This method of illumination allows the signal to be built to scale and works out nicely.
A study of the drawings and sketches will acquaint you with the different parts and their duties. Note that the signal can be removed without disturbing the assembly beneath the table and vice versa. A counterweight is placed on the upper rod to allow the blade to return to normal after the solenoids are de-energized.
All pictures are of the actual item. There may be reflection from the lights in some photos. We try to take photos of any damage. If this is a railroad item, this material is obsolete and no longer in use by the railroad. Please email with questions. Publishers of Train Shed Cyclopedias and Stephans Railroad Directories. Large inventory of railroad books and magazines. Thank you for buying from us.
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