Telechron Clock Rotor Type H:
The Telechron H clock rotor made it's debut in the 1930's and became the workhorse
of the GE/Telechron clock lineup through the 1960's. The primary H series rotor was
the H-3 which turned at 3.6 RPM and has a 10 tooth pinion gear. The earliest Telechron
H-3's had nickel/brass cases with bronze bushings. Telechron switched to copper
and finally lower cost aluminum (also lower quality internal parts).
The O.D. of an H rotor is about 1-3/8"
Telechron Nickel/Brass H-3 Rotor:
Telechron Copper H-3 Rotor:
Telechron Aluminum H-3 Rotor:
There are also some variations of the Telechron H rotor design. Here's a Telechron
F style rotor that has integrated standoffs in the body of the rotor. In most applications
an H-3 will replace one of these fairly scarce F's with two seperate standoffs. This
rotor had a short production run. I believe this rotor used a cast housing to preserve
brass during WWII.
Here's a Telechron H-10 Clock Rotor (Compared to H-3). The H-10 was a stronger torque
version with a longer tail and used with Telechron B style coils. The H-10 was used
in some Revere Westminster clocks.
Telechron also produced another high torque H rotor called the H-18. This rotor
looks identical to the common H-3 except it has a 3rd armature disk in the tail to
give it extra torque for certain Revere clocks:
Three armature disks = Higher Torque
Standard H-3 with two armature disks.
Some alarm clocks require this variation of the Telechron H-3 rotor that has an extended
pinion shaft. The F rotor pictured above can also come with this style long shaft.
This H-3 rotor also has brackets which as far as I can tell serve no meaningful
purpose. The brackets were eliminated fairly quickly in the H series rotors.
