Rectangular metal case and polythene insulated lid provided with finger flops to facilitate removal, case fitted with 4mm earthling socket. Front glass window slides up to allow insertion of ionizing ...

An metal rectangular case has a clear glass sliding front and ground glass back. A brass wire has a gold leaf attached to the lower end and a brass disc/bob at the top. This apparatus fitted on the Ba...

gold leaf electroscope A metal plate on which a single gold leaf supported by an insulating bush in a metal case with a 4mm socket earthing terminal. The front window is clear & the rear windo...