This H. D. J. Dunker designed trichinoscope is remarkably simple, robust, and heavy. It was manufactured in Berlin by the P. Thate company for many years. It has a horseshoe foot with a robust support shaft that is extended by a large iron plate (7 × 10.5 cm) that is fixed. The only approach is carried out by twisting a vertical spring by means of a horizontal wheel, located on the support axis.
Its condenser is simple: a four-diaphragm wheel that is driven from the front of the stage. The objective has three magnifying glasses in circular rings that are screwed in succession, achieving magnifications of x50.x60 and x70. At the end of the 19th century its price was 48 marks. A similar microscope is in the Museum Optischer Instrumente in Germany.