This site provides a wealth of technology information sheets for pupils and teachers
Woodpeckers SBG-7-23 7 in. Sliding Bevel Gauge
Why does the blade of a sliding T-bevel have a point? - Quora
Blue Spruce Sliding Bevel & Try Square – Lost Art Press
This 10 aluminum sliding bevel gauge is made by Shinwa in Japan. The stainless steel blade is 10 long and can be set at angles between 0°and 180°.
Shinwa 10
Crucible Sliding Bevel – Lost Art Press
Shinwa Sliding T-Bevel Gauge
Stainless Steel Blade Sliding T Bevel Square with Plastic Handle - China Combination Square, Angle Square
Making a Sliding T bevel
Stanley No. 25 6 Sliding Bevel
Blue Spruce Sliding Bevel & Try Square – Lost Art Press