Sort of off topic, but see the pic of this transparent Leslie:
http://upload.wikimedia.org/wikipedi...ie_Speaker.jpg
These are not original components though and therefore do not produce the original sound.
While the actual horn and working parts appear correct, the original horn driver is a Jensen.
Note the baffles in front of the actual horn opening to disperse sound. Still, the horn beneath the baffle only routed sound up one side of the assembly. If the sound came out both sides, Leslies would loose some of their characteristic sound.
When you hear a leslie in a real live situation, it is not like recorded music as the sound is "thown" around the room, rather than back and forth across your speakers. To truely appreciate the Leslie, it must be heard live.
You hear the doppler shift and the sound gets loudest as the open side of the horn approaches you. As it spins away, you hear it go quiet. As it approaches the inside wall of the front of the chamber, away from you (everyone runs their Leslies backward toward the audience for most volume and less internal dispersion), it again gets louder as the sound is reflects off the back of the front wall toward you. But not as loud as when it actually was facing you. Also, there is a shift in timbre as treble is lost in this reflected sound.
It continues to spin and gets quiet again now facing the other side of the cabinet before spinning back to its loudest point at the rear, facing the audience or microphone.
If both sides of the horn were open, it would sound the same when it points forward or rearward.
The woofer should be a CTS or Eminance with a square magnet assembly. There could also be a dust cloth around the lower drum.
The main amp is rated at 40 watts RMS and (if memory serves), 60 watts peak using a pair of 6550s. Crossover was at 800 Hz. If the unit were an RV (reverb), there would be an addition 16 watt tube amp mounted in the top chamber driving a Jensen 6"x9" mounted in one side of the main portion of the central enclosure. Like the horn, while both sides of the enclosure were "louvered" for the 6"x9", it was only installed on one side and the other had a block-off plate.
Some of the Leslies had a rectangular port on the rear cover (mine included). I don't really see how it could have done much, because contrary to the clear Leslie shown, the corner of the piece of wood that the woofer was mounted on (right front corner in picure) was cut out between the central chamber and lower chamber. Also contrary to the picture, there was no chamber around the horn motors and air leaked there too.
Leslies were also designed these for other makes of organs, and later multi-channel Hammonds made use of additional 6"x9"s and could use the blocked off louvers.
The Leslie with my H324 Hammond actually had the 15" with the lower drum, some stationary 6"x9"s for the other channels, and instead of the horn, a pair of 6"x9"s were rotated in the upper portion. Contact was through brushes.