|VK2DYM'S MILITARY RADIO AND RADAR INFORMATION SITE.|
In the mid 1920's AWA manufactured Reiss microphones using a solid marble housing and supplied them to the broadcast stations that it sold and managed. (see A.W.A. Reiss Microphones)
In November 1932 the Australian radio magazine RADIO MONTHLY presented a do-it-yourself article for amateur radio operators to build their own version. That article is set out below. The magazine lists either marble or maple as suitable housing materials.
Please note, this article is copyrighted.