[crackmonkey] T h E W a R p E r

phil phil at zork.net
Mon Nov 30 10:10:50 PST 1998


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                  (c)Copyright 1992 by Noah Spurrier

---------------------------
 Description of The Warper
---------------------------
The Warper is a simple device for enhancing the pleasure that you get from
running your Acid Warp program. The Warper is a single lens projector that
attaches to your computer monitor and allows you to enlarge and project the
Acid Warp images onto a wall, movie screen, white bed-sheet, etc. The
device should cost you less than $20.00.

I will give only a general schematic for building The Warper. The design is
quite simple and it will be easy for you to fit the design to your supplies
and equipment size. The only special item that you will need is one large
Fresnel lens. A Fresnel lens is usually encountered as a thin, floppy sheet
of plastic that has the same optical properties as a glass lens many inches
thicker. You may use a true glass lens. For our purposes we need a lens about
6 inches or more in diameter. A glass lens this size would be very heavy and
expensive, but if you have one on hand then try to use it because it should
give a better image. The following instructions assume that you will be using
a Fresnel lens.

You will need a lens about 6" x 6". You can make The Warper with a smaller
lens, but it will be less effective. You can certainly use a larger lens.
I will give sources of cheap Fresnel lenses at the end of this text. Don't
worry about focal length. For surplus and hobby grade equipment, you must
take what you can get. A focal length of about 5 inches is fine. Often you
won't even be told what the focal length is. Only the focus will have to be
adjusted to compensate for the focal length of your lens.

When you get your Fresnel lens, take it and your computer into a dark room.
Activate the computer and execute the Acid Warp program. Now Aim the
computer monitor at a white wall, movie screen, white sheet, etc. The
plane of the monitor screen should be roughly parallel to the plane of the
projection surface. Now hold your lens in front of the computer monitor.
The lens should also be roughly parallel to the projection surface and the
computer monitor. As you vary the distance between the lens and the monitor
you will be able to focus an upside-down image from the monitor onto the
projection surface. The exact distance between the screen and the lens will
vary on how far your monitor is from the projection surface and the focal
length of your lens. For my setup, a wall is about 12 feet away and the
lens is held about a foot from the screen. The image covers most of the
wall. You may never be able to get the focus good enough to read 80 column
text, but you should be able to easily read the Acid Warp title screen.

Besides the wobbly image and arm strain this method is flawed for one
technical reason. A very large amount of light leaks off to the sides of
the lens and fills the room with stray light. This badly washes out the
image. All that is necessary to fix this is to enclose the monitor is a
black box with the lens as the only opening for light to escape.

-------------------------
 How to Build The Warper
-------------------------
Here is the simple method that you can scale to your supplies and skill. You
only need two cardboard boxes to make the black, light-tight box. Use wood,
metal, or plastic if you want a fancy box. You will have to work out the
details for those materials by yourself. For my first prototype I used wine
boxes that I got from a bar where I work. Wine boxes are very sturdy. For your
boxes one should fit inside the other. You may need to rip the side panel
seam on one box and reglue it so that it is slightly smaller or larger. Fit
is not critical, as long as the boxes are snug, yet slide easily. This
telescope action will allow you to focus.

Spray paint the insides with FLAT BLACK paint. If you don't paint the inside
then the results will not be as good.

Cut a hole for the lens in one end of the larger box and attach the lens
over this opening. Remove the flaps from the other end of the box or fold.
them in. If you fold them in then the bigger box will fit more snuggly around.
the smaller box.

One end of the smaller box should have its flaps pulled open, but not cut
off. These flaps fit over and around the monitor. Remove the flaps from the
other end of the box.

When complete, the flaps of the smaller box should be taped to the sides and
top of the monitor. It does not matter if the fit is rough. The important
thing is to make sure that very litle light escapes and that The Warper is
held straight and steady on the front of the monitor.

The larger box will fit over the smaller box and slide toward or away from
the monitor screen. This will allow you to adjust the focus. You may need
to put some blocks under the front (lens end) of The Warper to prevent it
from sagging. I had no trouble with wine boxes.

If you cannot move the lens close enough to the screen to get proper focus
then simply trim a few inches off the edges of the open ends of the boxes
where the smaller box meets to slide into the larger box.

                                          /  FLAP
                                        /'
          |--------------------       /'.-----------        BACK OF
          |       -------------------|  \   TOP    |`\      MONITOR
         :|                          |   #         |  `\--, <------
         : HOLE                      |   #         |   |  |
         :                           |   #         |   |  |
         :                           |   #  SIDE   |   |  | CABLE
         :                           |   #         |   |  |-------()
    LENS :|                          |   #         |   /--'
          |       -------------------|  /   BOTTOM | /\     AC PLUG
          |--------------------      `\ `-----------'  \_________,--
               < ------- >             `\                        `--
                  MOVE                   `\  FLAP
                  FOR
                  FOCUS
                                                 CROSS-SECTION DIAGRAM

Your Warper is now ready for use!

For best results: use a white projection surface; make the room very dark;
turn up the brightness of your monitor. You may also need to adjust color.

-------------------------------
 Sources for Your Fresnel Lens
-------------------------------
American Science and Surplus Co.
(Formerly Jerry Co.)
601 Linden Place
Evanston, IL 60202
Orders 708-475-8440

AS&S sells a hodge podge of surplus items. Some of it is good,
some of it is junk. When you get their catalog, look for the "Optics"
section. They should still have a large supply of 11" x 11" fresnel lenses
for $1.95. They also sell an 11" x 11" Twin Layer lens for $3.25. These
lenses have minor scratches. A friend informed me that for our purposes
they work well. If they are sold out of these particular lenses then they
will probably have others that will work. Minimum Order is $10.00.



Edmund Scientific Co.
101 East Gloucester Pike
Barrington, NJ 08007-1380
Orders 609-573-6250
       609-547-3488
FAX    609-573-6295

Edmund Scientific Co. sells quality optics as well as hobby materials. When
you get their catalog, do not want to start looking in the Optics section
(unless you want to pay $30.00 for a 6" x 7" lens.) Look in the index under
"Fresnel" or "Lenses". There should be some lenses referenced in the hobby
section of their catalog. There, find a listing for an 8.5" x 11" lens for
about $7.95. They also sell a 7" x 10" lens for about $5.95. This is the
size I originally used.



Herbach and Rademan Co.
18 Canal Street
P.O. 122
Bristol PA, 19007-0122
Orders 800-848-8001
FAX    215-788-9577
Office 215-788-5583

H&R Co. sells new and surplus equipment for science and industry. They have
a small selection of inexpensive multilens units and rear projection screens
for TV projection systems. Most of the projection lenses are designed for a
specific size of TV tube and may not necessarily be ideal for a different
sized monitor, but the prices are low and these lenses are worthy of
experimentation. H&R also sells single multipurpose glass and fresnel lenses
in large sizes.



Macrocoma Co.
Dept. m
15 North Main St.
Washington Crossing, PA 18977
Orders 215-736-2880

Macrocoma is a weird company. They sell TV-Projector conversion kits. They
also sell a booklet on how to make Fresnel lenses. I don't recommend it.
They sell a Fresnel lens for about $15.00. I think the quality is supposed
to be quite good. Ask for "The Master Lens" (Special made, Triple
inspected, the best of the best.)

The Warper (c)Copyright 1992 by Noah Spurrier

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