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Fig. 2. Table assembly, showing platen, pantagraph, peg bars and control wheels.
shooting time. It may be folded out of the way when not in use or brought into position on the righthand side of the table. The pointer on the pantograph is also adjustable.
The camera carriage is engineered on a ball-bearing system similar to that used on the table. It follows the precisionmachined vertical track under heavy tension to assure the same accuracy of movement. The carriage is activated on a steel cable arranged for pulley action. The operator controls this mechanism by a handwheel to his left. Combined with this handwheel is a brake or clutch to hold the vertical unit in any position, and to control the amount of camera weight transmitted to the handwheel.
Vertical movements, as small as the width of the hair line on the vertical
scale, are easily controlled by the operator. This is desirable for making smooth vertical trucks. By releasing the clutch, the entire vertical carriage can be moved up or down very rapidly and the fact that ball bearings have been used at all friction points, both rotary and sliding, has made it almost effortless to make any of the intricate movements required of this equipment.
Counterweights were considered to relieve the pressure on the manual control of the vertical movement. On the pilot model, this unit functioned so easily that no counterweights were necessary. However, they may be added, should a heavier camera demand it.
Next on the vertical unit (Fig. 3), placed on a pivotal point over the optical axis, is a ring which allows 360° rotation
E. H. Bowlds: Animation Stand of New Design