
©2008 FISHBOWL #3 - interactive wire sculpture, 11'' h x 12.5'' w x 9.5'' d • Turning crank causes curved rocker arm to move back-and-forth, making fish 'swim' in a realistic manner

©2008 FISHBOWL #3 • rear view • crank with handle operates rocker arm by means of wire connecting rod
I posted photos of two wire fishbowls in my September 15 and October 16 posts in the ‘Something New’ category. I just completed another interactive sculpture with a wire fish and crank, but this one features an authentic glass fishbowl, mounted with guy wires to a plywood base with a combed acrylic paint surface to suggest water. Wooden blocks serve as feet.
The crank mechanisms on each sculpture are different, and each was quite a challenge to me. On this third sculpture, I wanted the crank to be in the front, which meant I had to figure out a way to transfer movement to the rear, and then to the top center of the bowl. I didn’t want the crank mechanism wires to be seen through the fishbowl, which presented a further problem to solve.

Close-up view of 3-part articulated fish - made from 18 gauge black annealed wire and 20 gauge copper wire
As you can see in the photos above, my solution is simple. The front crank creates a circular motion, and the connecting rod transfers that motion to the rear rocker arm/crank and creates a back-and-forth motion. Notice the different sizes of the U-shapes in the front crank and rear rocker arm/crank. The tricky part was to get these just right for the proper amount of movement, and this required lots of minute adjustments to the crank and rocker arm/crank.

Fishbowl mounted to painted base with guy wires and hook eyes, fish on hanger inside bowl, sketchbook with numerous fish shapes at right

Trial crank and rocker arm in place with additional crank parts at right
In addition to all that, the rocker arm itself, even though it’s made of 16 gauge galvanized steel wire, was too flimsy to make the fish ’swim’. I tried a number of different curves and right angle shapes and none worked. Finally, I constructed a new rocker arm mechanism, with the same graceful curve I started with, and ‘work hardened’ it by placing it on my pounding block and lightly hammering it. It was noticeably stiffer. I got excited. Now I had to feed the bent and hardened rocker arm through the two tiny holes in the rear guide - no easy feat - just to see if it would work.
To do this, I partially straightened various right-angle bends and very carefully worked the rocker arm/crank through the holes, re-bending the wire as I proceeded. Then, I tied the upper part of the rocker arm to the fish hanger with scrap wire and gently operated the crank. It worked!
FISHBOWL #3 is for sale - click here if interested.

Close-up of front crank and rear rocker arm mechanisms, guy wires and hook eyes

Close-up of rocker arm (far right) attached to fish hanger, guide loops, hanging seaweed