Illustration of steel square with hypotenuse drawn.
Illustration of steel square with bevel/slant.
An instrument for indicating the pressure of the steam in a boiler.
Illustration showing a survey on the lake front in Chicago with distances and angle measures shown.
"An instrument much employed in land-surveying for the measurement of angles horizontal and verticle."…
For the builder or architect who wants to raise the standard of his work- who takes conspicuous pride…
Illustration comparing the fundamental units of measure ounces to grams and pounds to kilograms.