AstroMedia 419.COB Instructions de construction - Page 9
Parcourez en ligne ou téléchargez le pdf Instructions de construction pour {nom_de_la_catégorie} AstroMedia 419.COB. AstroMedia 419.COB 12 pages. Camera obscura
Imprimer la pageE2. The Mirror and the Viewing Screen
Without a mirror, the image would fall onto the back wall
of the housing and would be upside-down. Reflecting the
image upwards at right angles with a mirror results in an
upright mirror image. The viewing window alone does not
display the image because the light goes straight through
it. But when a piece of semi-transparent paper (tracing pa-
per) is placed on top, the image appears.
Step 23
As a test, place the mirror with the protec-
tive foil facing upwards into the housing from above
so that its side edges are flush with the two mirror
supports. Its upper edge is pretty close to the future
cover, the distance between the lower edge and the
base panel is significantly larger. Refold the mirror
supports so that they are perpendicular to the side
walls and glue the mirror in place. Push the side
walls together lightly and make sure the top open-
ing of the case is square before the glue sets. This
can be checked easily with the help of the trans-
parent viewing screen, by placing it temporarily in
its future position on top of the glue tabs. Allow to
dry thoroughly and then remove the protective film
from the mirror.
Step 24
Using a craft file or sandpaper, roughen all
four edges of the viewing screen to a width of about
1 cm on both sides, so that the glue adheres better
to the plastic. If you don't have sandpaper, you can
scratch the edges with a sharp object, but be careful
not to scuff or scratch the viewing area. Then fold
the glue tabs of the housing again so that they are
horizontal. Glue the viewing screen onto the hous-
ing and check that it does not protrude on any side.
Weigh the screen down while the glue sets, e.g. with
a book.
F. The Edging Strips
The 12 edging strips cover the glued edges of the hous-
ing and increase its stability. Four of them [F7, F8, F10 and
F11] have punched cut-outs that will later accommodate
the footrests of the visor. The places to which they are to be
glued are indicated by the accordingly shaped glue mark-
ings. The edging strip [F9] has a glue mark on its outside. It
is used to attach the top cover, which also serves as part of
the visor.
Step 25
Fold all edging strips 1 to 12 [F1 to 12, sheets
5, 6 and 8] sharply backwards. Make sure the fold
goes precisely through the pointed ends. Glue the
edging strips [F1 to F4] to the four edges of the base
panel, then the edging strips [F5 and F6] to the two
vertical edges on the right and left of the rear wall.
Their pointed ends should touch without gaps and
their tips meet at the corners of the housing.
Step 26
Glue the edging strip [F7] to the edge
formed by the front wall and the left side wall in
such a way that the half-oval cut-out is positioned
at the bottom of the left side wall, as indicated by
the glue marking. Then glue the edging strip [F8] to
the front right edge of the housing accordingly.
Step 27
Next, glue the edging strip that has the
grey glue marking [F9] onto the upper front edge of
the housing above the lens. The half with the glue
marking is glued onto the viewing screen. Then
glue the edging strip [F10] to the upper left edge
of the housing. The punched cut-out should be on
the back of the left side wall, towards the back wall,
as the glue marking indicates. Correspondingly,
the edging strip [F11] is glued onto the edge of the
housing at the top right. The last strip [F12] then
fills the last free space at the top back.