A BELT PAPER KYMOGRAPH WITH A THREE SPEED GEAR SHIFT.

1. Herein has been described and illustrated a belt paper kymograph, electrically driven, and provided with a three speed gear shift. 2. By the use of this gear shift the operator may instantaneously change the speed of his paper from intermediate to high speed which is four times faster or to low speed which is four times slower. 3. By the arrangement of gears here shown no clutch or clutch lever is needed, and the operator may readily alter the speed by the use of either hand. 4. Although this gear box may appear somewhat complicated and difficult to construct it was built by junior and senior college students in mechanical engineering.