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Mex(1) Construction Sets

Mex(1) was an unusual construction system. The strips etc had slots to the edge on them in addition to holes. This UK system was made in Bavaria in the early to mid 1930s.

Manufacturer / Distributor

W.H. Cornelius 23 Paper Street, London, EC1, UK
Actually made in Bavaria, Germany

Info from the Metal Constructional Systems Database for MEX [1]

System Type
Hole pitch >12.7mm
United Kingdom
1933 to known in 1935
Boss Type
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
13.1 (mean)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
--- (Screwed Rods or Bolts are used as axles.)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: tapered cheese (slotted)
Material/Finish of Nuts and Bolts
Steel with a Brass finish
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Lid has boy with Tower Bridge. Made in Bavaria on No.1 packet. Ni Strips & Wheel Disc with ¼" long slots to edge between holes, & ½" lengthwise slot over some holes. Disc pitch 9.5. Parts joined by N&B or engaging slots.

The MCS document for this system is shown below. It can also be downloaded to your computer if desired here

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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided

Below there are manuals/leafets which can be downloaded by clicking on the appropriate image.

A Mex(1) instruction leaflet.