AstroMedia Hands-on Science Series Instrucciones de construcción - Página 7

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C. The Base Panel

The base panel has glue tabs on all four sides. It consists of

four trapezoidal parts and the octagon detached from the

front wall. These five parts are glued together on the back

with eight connecting pieces (Fig. 3). On the side facing the

inside of the housing, all parts are black, including the con-

necting pieces.

C13

Fig. 3: Base panel

Step 9

Remove the base panels 1 to 4 [C1 to C4,

sheets 1 to 4] from the cardboard, as well as the

large connecting pieces 1 to 4 [C6 to C9, sheets 1

and 2] and the small connecting pieces 5 to 8 [C10

to C13, sheets 1 to 4]. The octagonal central base

panel [C5] was left over from Step 1. Fold the long

glue tab on floor panels 1 to 4 backwards.

Step 10

First place two of the trapezoidal base

plates with the black side facing upwards on your

work surface so that the sloping edges meet and

half an octagon is formed in what is going to be the

centre. Glue one of the larger connecting pieces over

the joint. The pointed end of the connecting piece

points to the corner and the blunt end protrudes a

little into the area of the octagon. Make sure that

the edges of the base plates meet without a gap and

that the black side of the connecting piece is facing

upwards.

Step 11

Place the octagonal base plate [C5] with the

black side facing up in the gap provided so that one

of the narrower glue marks is under the protruding

end of the connecting piece and all edges butt to-

gether without gap. Glue the part to the connecting

piece. Now attach the other base panels in the same

C10

C11 C2

C12

way using the large connecting pieces and finally

glue the small connecting pieces to the remaining

free edges of the octagon (see Fig. 3).

Step 12

Check that the space where you can write

your name and the year of manufacture faces the

direction you want (towards the front or back of

the camera obscura). Fold the glue tabs of the base

plate backwards again and push them between the

two side walls of the housing until they touch the

front wall. Then glue the bottom panel to the front

wall. Push the front wall onto the work surface so

that the base is flush with its bottom edge. As a test,

push the two side walls against the base and check

that the base sits exactly in the middle. Then glue

the side walls to the glue tabs on the base panel.

Step 13

Detach the round centre cover [C14, sheet 7]

from the cardboard. The ring between parts D3 and

C14 is not needed and can be discarded. Glue the

cover onto the outside of the octagonal centre sec-

tion of the base panel. This covers the small round

disc that was not removed.

D. The Inner Lens Tube

The inner lens tube has a slightly smaller diameter than the

outer one and houses the objective lens.

Step 14

Fold all groove lines of the inner lens tube

[D1, sheet 5] backwards. Again, an octagonal tube,

black on the inside, is formed with the two half seg-

ments touching. Connect the two half segments on

their inside with the connecting piece [D2, sheet 5].

Make sure that the edges of the half segments butt

against each other without a gap and that the black

surface of the connecting piece faces towards the

inside of the tube.

Step 15

Remove the lens holder [D3, sheet 7] from

the cardboard and fold all 8 glue tabs backwards. The

enclosed acrylic glass lens is used as the objective

lens. It has one curved side that points towards the

object, the other side is flat and faces towards the

inside of the camera obscura. Handle the lens by the

edges only and, if necessary, wipe fingerprints off

with a soft cloth (don't use tissue paper, as it scratch-

es the surface). Place the lens holder with the black

inside facing up on your work surface or, even bet-

ter, on top of a small cup and try the lens on it with

the curved side facing down. Remove the lens again

and coat the lens holder with glue around the hole to

a width of about 3mm. Check that no threads of glue

have formed across the opening, then carefully place

the lens on top and centre it. Leave to dry completely.