AstroMedia Hands-on Science Series Инструкции по строительству - Страница 6

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Step 3

Fold the 3 glue tabs of the right side wall

[A3, sheet 2] backwards as well and glue the right

edge of the front wall to the glue tab in the same

way. Now the three walls form part of a box with the

base, back wall, and lid missing.

B. The Outer Lens Tube

The outer lens tube serves as a guide for the inner lens tube,

which will be built in Section D. The inner lens tube can be

moved back and forth inside the outer lens tube so that the

objective lens can be focused on objects at different dis-

tances.

Step 4

Remove the outer lens tube [B1, sheet 5]

from the cardboard and fold all 8 long groove lines

backwards. When you butt the edges of the two

half-segments at the ends of the piece of cardboard

together, a short octagonal tube is created that is

black on the inside. The small glue tabs marked in

grey are the foot tabs with which the tube will be at-

tached to the inside of the front wall. They all need

to be folded forwards towards the gold printed side.

In order to turn the folded piece of cardboard into

a stable octagonal tube, you need the connecting

piece [B2, sheet 7]. Glue it to the outside of one half

segment so that it sticks out exactly half way, then

glue it to the the other half. This works particular-

ly well if you press the tube flat, so that both edges

are pushed against each other without a gap. Make

sure there is about a millimetre of space between

the connecting piece and the foot tabs.

Fig. 2: Outer lens tube

Step 5

Step 6

Step 7

Step 8

Hold the outer lens tube horizontally and

turn it so that the side with the connecting piece

is facing downwards. Slide the foot tabs through

the octagonal opening in the front panel from the

outside and glue them to the glue marks located

around the opening.

Tip: Press the inside of the front wall onto your work

surface to push the foot tabs in place.

Fold the grooved lines of the edge rein-

forcement [B3, sheet 5] backwards and glue it onto

the glue marks around the opening of the outer

lens tube. The seam where the ends of the edge re-

inforcement meet should be at the bottom of the

outer lens tube.

Four supports are required to stabilise the

connection between the outer lens tube and the

front wall. Fold the foot tabs of the 8 support parts

[B4 to B11, sheets 1 to 4] forwards and glue each two

of them back to back to form four angled supports

with two foot tabs on one edge. As a test, first place

one of the supports with its foot tabs on one of the

glue marks on the outside of the front wall and push

it against the outer lens tube. The edge of the sup-

port without tabs butts against the wall of the tube.

Apply glue to the foot tabs and to the blunt edge

and glue the support in this position. Glue the oth-

er three supports in place the same way. The lower

support is glued to the connecting piece that holds

the outer lens tube together.

Fold the two mirror mounts [A4 and A5,

sheet 6] backwards at right angles. This creates

two angled strips that are black on the inside and

grey on the outside. Glue the mirror holders onto

the two glue marks located on the inside of the left

and right side walls.

Important: The folded edges must be exactly flush

with the edge of the glue marking to which the arrows

are pointing. The mirror itself will be installed in Sec-

tion E-2.