Engineer & Entertain

Ideas I grapple with

Archive for the category “Magic”

Science Friction

After watching “The Hot Seat Card Magic Trick” episode of Scam School I became interested in the Pilot Frixion pen. Watch the video below if you want to learn the trick in full, but what interests me is that the pen’s ink is erased by heat.

Previously I was only aware of the erasable pens which used an ink mixed with a rubber cement like material. Until the rubber cement set, the ink was erasable.

My first thought, “Could I use this pen to journal my plans of taking over the world and then throw it in a hot place to erase the evidence when the FBI raids me?”

The answer is yes, but really no. While the ink does disappear with heat from an open flame, oven, or vigorous rubbing, the content is still easily read by applying a raking light to view the impressions made by the pen.  Not to mention the FBI could use electrostatic detection to read my plans for global domination.

A raking light is applied so the impressions can be read.

Highlighting some of the impressions.

 

Furthermore, the ink reappears when the paper is chilled in a freezer. It is not as dark as when it was first written, but it is very legible. I like the idea of writing a secret message, erasing it with heat, writing a non-secret message over it, and then having the recipient freeze the letter to read the hidden message.

The original message

The message reappears after being frozen for less than a minute.

 

Microwaving the ink would require a considerable amount of time to be erased. I microwaved an index card with a message for 10 seconds, 20 seconds, 30 seconds, 60 seconds, and 120 seconds. When microwaving the card, I also microwaved 1 cup (250 mL) of water. The water was there for safety reasons as I was unsure if the index card would catch fire if it was microwaved alone. The message remained intact until it was microwaved for 120 seconds. After being microwaved for a two minute duration, small portions of the message were erased. Not enough for me to recommend microwaving the message as a method of erasing it for a magic trick or removing evidence of a plan for global domination.

After microwaving for 120 seconds

After microwaving for 120 seconds.

 

The Frixion pen is useful for magicians, people who schedule their calendars with ink, and students who want to appear they live life on the edge by taking a math test in ink. Despite all of these uses I cannot recommend it for planning the crime of the century.

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Oh Snap!

Photobucket Pictures, Images and Photos

I certainly have no need for another old, lame magic trick like the snapper. I made the device so I could appreciate the lesson Roy Underhill provided when he made it on The Woodwright’s Shop.

The snapper could be made could be made by cutting the pieces first, drilling the hole, and then shaping it. You could drill the hole, shape it, and then cut the pieces. You could shape it, drill, and then cut. You could . . . as you see, Grasshopper, there are many wats to the tree. So, why do we do it the way we do it? We drill the hole first, shape it, and then cut the individual pieces because it is easier to work the wood as one unit. The lesson is in order of operations: leave it long, trim to fit.

Let us move from theory to practice. The wood is 3/4″ Photobucket Pictures, Images and Photos
And about 4″ long. Photobucket Pictures, Images and Photos

A 1/4″ hole is drilled in the center of the square end. Photobucket Pictures, Images and PhotosThe hole runs the length of the block. A 1/4″ diameter is used because that is the size of the dowel rod used to make the hook of the snapper.

One end is chamfered by cutting the corners with a saw. Photobucket Pictures, Images and PhotosThe chamfers were then shaped with a rasp. Photobucket Pictures, Images and Photos

The individual pieces were then cut. The body is 3″ long and the snapping end is 1″ long.

A small plug for the bottom of the body was cut from the dowel rod. Photobucket Pictures, Images and PhotosIt is glued in place with a rubber band. Photobucket Pictures, Images and PhotosAs the rubber band does not actually do any thing, there is no particular method needed to secure the rubber band in place. I simply shoved it in with the plug and glued it all with wood glue.

Notch the dowel rod to make the hook. Photobucket Pictures, Images and PhotosLike the rubber band, the hook serves no purpose. It does need to look like it could hook the rubber band though to sell the trick. The hook is then glued in place. Photobucket Pictures, Images and PhotosOnce it is dry, the dowel is cut flush with the head. Photobucket Pictures, Images and Photos

To use the snapper, squeeze the chamfered ends to shoot the end into the body. To make this entertaining you need to act like there is some skill and dexterity needed to hook the rubber band. Also, to make this entertaining, it helps if your audience consists of your young nieces and nephews.

Pulp Fiction

My nephew had a birthday last week.  I am surprised by how many people have birthdays these days.  For his birthday I gave him an orange. 

If it was a lemon it would be a sour pus

The orange I gave him had, “Orange you glad it’s your birthday?” written on it.  In addition to the scurvy fighting ascorbic acid contained in every orange, it also had a 20 dollar bill inside.  The banknote made its way inside the same way it does in the following magic trick.

When was the last time you had a 20 dollar trick?  My nephew had one last week.

Bank Night

It’s ok Penn & Teller, he fooled me too.

Bad Magician, Good Magicians

David Blaine posed for some photos in Esquire; photos which required trick photography.

It took five tries to get the shot.  From the start Blaine said it would not work.  I am surprised he thought it would not work considering Penn & Teller did it several years before on live television.

This is why we study history.

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