Tesla’s original patent application for the use of his famous coil to transmit electricity wirelessly. This amazing device is a radio frequency oscillator that drives an air-core double-tuned resonant transformer to produce high voltages at low currents.
Also available as a t-shirt.
Black Organic cotton tote bag with long handles.
Measures 36 x 38cm, with 8cm gusset
Capturing that excruciating moment when Mr Gove argued that if all schools improve their performance then they can all be above average. Genius! Strong cotton book bag with long handles. Measures 38 x 43cm.
The Circle of Fifths is a fundamental concept in western music, underlying the mathematical relationships between musical keys and key signatures as well as the chromatic scale itself. This elegant tote bag is made in high quality cotton canvas with thick soft handles, and a...
Celebrate beetlemania with this brilliant tote bag featuring the fab four: Calosoma sycophanta, Aromia moschata, Cetonia aurata and Polyphylla fullo. Black canvas book (or record) bag with long handles. Measures 36 x 39cm.
Did you know that there are over 250 species of bee in Britain? This organic cotton tote bag shows several of the major sub-families, from the biggest bumblebees to the tiny wasp-like nomad bees. White organic cotton bag with long handles. Measures 38 x 41cm.