the Finacci Mirror, a 19th-century circular animation device similar to the gif diagram, was previously introduced in the push. (related Reading: Finacci Mirror: make a small animation from 185 years ago! ).

at that time, the article introduced a method of making a simple Finacci mirror, which only needed a round piece of paper and a bamboo stick as a rotating shaft to look into the mirror.

but this version is really, very crude. So today I'd like to introduce a slightly more elaborate version of DIY, this time without having to look in the mirror.

(children need to use art knives, awls and other tools, please do it with the help of adults)

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potato chip buckets

ruler

toothpicks

awl

scissors

(this step I use an art knife, be careful not to cut my hand)

next, divide the cut piece of paper equally. The potato chip bucket is not very wide, so here it is divided into eight equal parts, and the operation will be relatively simple. If it is a thicker paper tube, it can also be divided into twelve equal parts.

the method of equal division: cut out a long piece of paper, wrap it around the outside of the cylinder, and mark the position where the length is equal to the outer perimeter of the cylinder. Unfold the paper and divide it into eight equal parts by folding in half many times according to the length of the circumference of the tube. Next, the paper marked with eight equal parts is wound back to the outside of the paper tube (pay attention to close, can be temporarily fixed with duct tape), the position of eight equal parts is marked on the paper tube.

the next step is to cut eight slender slots at the octave mark on the side of the paper tube. Each slit is 2cm in length and about 2mm in width (none of which needs to be particularly precise to ensure that it is roughly equal).

(the potato chip bucket is thin, you can do this with scissors)

to prevent interference with the observation, the outer wall of the potato chip bucket should be painted black with acrylic paint.

drill a hole with an awl in the center of the bottom of the potato chip bucket and insert a toothpick as a hinge (preferably fixed with something like hot melt glue to avoid shaking).

the method of PS:SickScience is to directly use the pushpin in the following figure as the pivot. I think this should be more stable, but I just don't have it on hand, as shown in the following figure:

the next step is to prepare the animated image. Corresponding to the eight-equal slit on the tank, the paper with eight images will be placed on the inside of the potato chip jar.

cut a long piece of paper with a width of 3 cm, insert it into the potato chip bucket and stick it against the barrel wall, marking the position where the length is equal to the perimeter of the inner wall. The next step is to take out the note and divide it into eight equal parts according to the length of the perimeter.

next, draw eight frames of patterns in a small grid of eight equal parts. Let these eight frames form a small circular animation will look more smooth, for example, what I draw here is a left-right swing-well, I don't know what this is.

in order to ensure that the pattern of each grid does not deviate as far as possible, I will first draw it with a pencil in one grid, then paste it on the other grid of the note (make sure the edges are aligned), and then scrape it with my fingernails. let the pencil leave a mark on the second as a location reference.

after all the paintings are done, just put the patterned paper into the potato chip bucket and close to the barrel wall (as pictured above, it can be fixed with double-sided glue).

finally, as long as you turn the shaft and look at the pattern on the inner wall through the narrow slit, you can see that the small pattern seems to be moving in place.

the slit actually plays the role of "controlling the frame rate". No matter what the rotational speed is, it ensures that you can only see the next frame when it turns to the position where the previous frame appears. So we think that the picture that rotates quickly looks like a small animation that stops in place.

of course, watching animation through narrow slits is always a bit unenjoyable. It is also possible not to use narrow slits, as long as the rotational speed of the picture matches the "frame rate" of the human eye or the camera. There are also designs that use light that flashes at a specific frequency and is illuminated only when the picture is turned to the right angle. However, for manual operation, it is difficult to keep the speed constant, narrow slit is indeed the easiest way to achieve animation.

the infinite cyclic map of the 19th century, if you are interested, please come and see ~

with a sample pattern of twelve equal parts: