Public domain photos

The image shows a drawing of a machine with a clock on top of it. The machine is a radiotelegraph, which is a device used to transmit signals from one device to another. The drawing is accompanied by text that provides further information about the device.

The image shows a drawing of a machine with a clock on top of it. The machine is a radiotelegraph, which is a device used to transmit signals from one device to another. The drawing is accompanied by text that provides further information about the device.Open in library