CORNING Cover glass matched to CORNING 2 1/4 F.

Difficult to photograph while keeping two lenses together ..

anyway

I have been using CORNING 2 1/4 for a style D electric semaphore lamp.

while the NHRR made do with materials on hand to replace broken things.

 

The signal maintainers at Framingham center used CORNING'S 2 1/4

lenses in the US&S style D dwarf semaphore's lamps.

something i recall very well as i've seen them in service.

 

But ive wondered about these rather flat lenses and their actual intended use.

I came across a Bulletin around the time of this posting .

 

The bulletin showed a "cover Lens" 5 3/8 D. and it was paired with the 2 1/4.

The Bulletin also stated that the lens ,,apparently... its facets are pointed toward rail traffic

the cover D.C.G. is "paired to protect the prisms from debris.

 

I knew one lens i had , just looked as strange as the 2 1/4 F But the clear CORNING

D.C.G.. as odd as it is to me ,now makes sense when the two are fitted together..

I still would like to see the intended signal for this lens couple.

Done