Standard Slide Rules

Blundell (BRL) Aristo   PIC British Thornton Faber Castell Military
Pickett Sun Hemmi Simplon Unique Others Special Rules

Most standard slide rule sizes are 6, 10, 12 inches in length. There are a few larger ones of 22 and 24 inches. Some were made mainly for classroom and demonstration purposes. These are typically 3 - 6 feet in length (Approx: 1 - 2 metres). The majority of slide rules have 4 main scales A, B, C, D. Others have many more.