"R.H." wrote:

This set should be a little easier than the last one, only two of them are
unidentified:

http://puzzlephotos.blogspot.com/


Rob

1109 works with a brace. No idea
1110 makes ribbed roofing?
1113 No idea but Lorana Bobbit shouldn't own one.

This was easier?

Wes

Quality bridges are used in labs all of the time. The manual ones
are in laboratories for experiments, but the electrical and electronic
ones measure R-C-L components in various combinations. Often the AC
speaks of the ability for the C-L or reactive bridge branches.

Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


DT wrote:
1114 - I don't thnk this is a simple wheatstone bridge. Wheatstone bridges
work on DC. This has crude switches labeled D.C. / A.C. that are ganged
together, and a switch that selects between TEL / GAL. It may be an early
form of a multi-function meter. It may be a conductivity bridge which can
use either DC or AC as excitement. The TEL/GAL switch is interesting. GAL
may represent galvanometer - a type of ammeter. The wikipedia article for
galvanometer (http://en.wikipedia.org/wiki/Galvanometer) also states that
they were used as a receiver for telegraph systems. This may be what the
TEL represents. Might this be a test set of some sort for troubleshooting
telegraph systems? It could also be a test set for checking telephone
lines as the date 1918 (8/13/18 date on warranty sticker) would place it in
the early days of commercial telephony.


A.C. wheatstone bridges use sound instead of a needle deflection. When they are
nulled, there is no sound from the headphone.


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