vintage wall chart poster sinusoidal AC voltage heavy current engineering
a vintage pull-down wall chart showing „How do you achieve a sinusoidal AC voltage in heavy current engineering?“. used as teaching material in German schools. colorful print on paper reinforced with canvas. Great wall decoration. Published in the German democratic republic, Berlin.
the measurements shown above refer just to the canvas and do not include the poles. please contact us for further details of the overall measurements of the specific chart. all offered wall charts are in a good original condition. they have been utilised and therefore show age-related traces of usage. some wall charts have been laminated partly with glue stripes. during storage the wall charts are partly fissured, stained and some sometimes smell. the wall chart´s crossbar (either metal or wooden) could be damaged or dented. further visible defects like e.g. water spots, hand-written marking etc. are separately mentioned in the article description (see picture). in case of uncertainty please feel free to contact us.
shipping can be disposed to anywhere in the world. charts with width larger than 120cm (47,24 inches) are dispatched as bulky goods. therefore shipping costs are partly very high. if possible we arrange combined shipping to reduce costs. items are shipped with dhl premium or UPS service. please note that overseas shipping last approximately 2 -4 weeks upon the day of shipment. if you need expedited shipping please contact us.
wall charts history
the idea to upgrade every day school life by using pictures was supported in the late 18th century by Johann Bernhard Basedow. In 1774 he published a four-volumned book "Elementarwerk" which combined pictures, text and information with merely hundred copperplates. Modern printing methods enabled the spread from rich private schools to rural grade schools. From 1820 to 1836 the oldest mentioned series of wall charts were published with the range of six booklets including 63 large sized charts. The rising 20th century was the golden age for publishers printing wall charts. Artists masterly performed pictures which combined the subject-specific standards of a scientist with the standards given by an educator and finally created a magnificat art work.