Schoolcentrale

naar de Nederlandse versie
These punch forms were used for punching the small cards; This was sheer drudgery from the time of cheap manual labour.

For the "Schoolcentrale" (School Centre) in Hilversum, later in Naarden, after 1955 a series of educational tools were developed and produced, mostly with square pieces, cut out of hardboard (with rounded edges, see picture on the left). The schoolcentre also had a standard board (also made by Klaus, A-3 size, made out of hardboard) on which square images had to be laid in logical order to finish rows by colour or another logical sequence.


Leesplankje ("reading-board")
In the educational section, our father developed his own 'reading board', not only because there was a copyright on the existing version. Mostly, however, because he thought that de standard version by Hoogeveen used quite a few names like "Mies" (as name of a cat) en "Gijs" (as the grandfather's name). That is not logical(especially if your own cat is named Rocky). A child could only do this, if they new the board. Our father's cat was therefore called 'poes' (Dutch for cat). All the letters in the pictures' descriptions were overall the same, though. The drawings were by his own hand (as were most of the drawings in the puzzle discs).
The reading boards were sold in a box similar to the 'slingerpuzzel' (meander puzzle, a rectangle with fixed frame sawn with meandering lines, see black and white picture) with letters on small wooden blocks (see picture on the right) or with a small box with letters on cardboard.
The triplex, with three rows of letters and groups of letters were printed and varnished. The result was cut in three strips with the circular saw and stapled together. Than the stack was cut in blocks on a machine (thought out by our father) with 17 circular blades with different distances on one shaft (as the blocks had different widths. The 3 x 16 blocks (plus the six empty ends with staples) went down a slide into a box with a gauze bottom to lose the sawdust and then turned over into the box with the board.
The letters on cardboard came printed to the factory in an identical size to the wooden plate with three lines of letters and were cut to size on a guillotine paper cutter.
On the front of the reading board were stapled three slim slats. The slats were laid in a board with three grooves in the right place, the reading board put on top, backside up, and stapled with a stapler operating on air pressure.
 
Topographical puzzles
Kolibri Puzzles also made a collection of topographical puzzles, depicting the map of the Netherlands and of it's separate provinces.
Other educational puzzles  

The traffic signs, traffic lights and traffic columns were drilled from the bottom and top edges in the thickness of the wood giving the possibility to put them on a stick. With the stick in a pedestal (both supplied in the box) the items could stand upright.

to continue: MISCELLANEOUS