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FIG. 1: Above, flexible shaft is seen leading at inner end to projector's hand turning knob, at outer end into hollow, liquid-rubber-filled flywheel.
FIG. 2: Outer end of the non-flexible shaft, which has been bolted to the front face of flywheel, bears on recorder's roller to become tape capstan.
A synchronized tape recorder
HERE in Holland (from where I write) we do not have as yet the Bell & Howell 202 magnetic projector. And I rather doubt that we will have it for some time to come. But we do have widely available the excellent English-made version of Bell & Howell's optical sound projector (G-B Model 621). And we do have, of course, plenty of magnetic tape recorders. So I decided to combine the two for synchronized sound — to combine them integrally, that is, not just with the usual stroboscopic disc or synchro-pattern on the tape itself.
The results are pictured on this page. And while you amateurs in America, or England or elsewhere, may not be able to follow my mechanical design exactly, due to differing equipment units, I believe that you can quite easily follow its general principles.
The Bell & Howell projector, at least, is the same
H. J. M. E. GEERUNG, ACL
everywhere. And you begin with it. As you will know, there is positioned behind the gate lever of this projector a hand turning knob which is geared directly to the machine's motor drive. The knob itself is first removed, exposing the axle, and a suitable length of flexible shaft is then joined to it (see Fig. 1). This shaft is fed through a sleeve into a hollow flywheel, and a four-bladed fan or paddle wheel is attached to its end. The hollow flywheel is then filled with liquid rubber, or some other viscous liquid, and the cover ( see Fig. 1 ) is bolted in place. On the front face of the flywheel a second axle (this one non-flexible) is now attached [Continued on page 337]
By coupling recorder and projector with an ingenious fluid drive, this amateur achieves unfailing synchrony
AT LEFT author's complete assembly is seen with tape and film reels mounted and ready. Note power cord connection.
AT RIGHT tape and film arms have been demounted for storage or transport, while protective cap shields capstan.