Ridderhof’s Anaglyphs study of descriptive geometry

Ridderhof’s Anaglyphs study of descriptive geometry

Stock Number: 00 391028 h S



25 x 32 cm



Country of manufacture


Categories: Scientific, Calculating, Physics & Chemistry


Anaglyphs, used in the study of descriptive geometry in secondary schools. Manufactured by W.C.A. Ridderhof, Teacher 1st H.B.S. 5 years, The Hague. January 1927. The set consists of the  Original Anaglyph glasses, 10 plates and a description.

Anaglyph is a method to view Stereo. Anaglyph shows two separate geometric spatial figures on top of each other, a red image for the left eye and an image for the right. When viewing these images are split again, by viewing them with special glasses. These so-called ‘anaglyph glasses’ (glasses with a red filter on the left and a cyan filter on the right) filter out two different images from the anaglyph image. The left eye only sees the image in red, and the right eye only sees the image in cyan (green plus blue). In earlier applications green was still used as the filter color, nowadays cyan is the most commonly used color.

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NL Van Leest Antiques

Van Leest Antiques

Van Leest Antiques, based in Utrecht in the Netherlands, specialises in antique scientific and medical instruments. Their collection covers mainly scientific and medical antique instruments: barometers, globes and planataria, nautical instruments, anatomical models, and pharmacy items. Toon Van Leest travels regularly in Europe and visits trade fairs, auctions, and antique dealers to collect stock and to find pieces to fulfil his clients' unusual requests.

As well as being an avid antique collector and dealer, Toon Van Leest is also a dentist. He believes that antiques are a stable investment, not reliant on trends or fashion, and have truly lasting value. Above all, he says, antiques are timeless and never lose their beauty.