A center screw bow to draw circles. The adjustable screw is in the middle of the bow.

A test to check if the compass is aligned by bending the knuckle joints together and bringing the points…

Illustration of a compass with one leg at point A on the line segment and the other at Point B.

Illustration of a compass with one leg at point O on the line segment and the other at Point M.

This small compass was carried by Mohammedans (Muslims) in Indian when traveling. It is made out of…

"On horizontal center line mark off eight points 3/8" apart, beginning at right side of space." —French,…

"On horizontal center line mark off eleven points 1/4" apart, beginning at left side of space. Draw…

"Draw Horizontal line throuch center of space. On it mark off radii for six concentric circles 1/4"…

"Circles up to perhaps three inches in diameter may be drawn with the legs straight but for larger sizes…

Bow instruments can be used for drawing small circles. Hold the the left hand and spin the nut in or…

The illustration shows the finger position of the compass after the revolution. — French, 1911

The little finger on the left hand can guide the needle point of the compass to the center.

"A circle may be shaded by shifting the center on a 45-degree line toward the lower right hand corner...…

"Draw a circle three inches in diameter. Divide the circumference into five equal parts by trial with…

"On base AB, 3 1/2" long construct an equilateral triangle, using the 60-degree triangle. Bisect the…

"Draw one and one-half inch square about center of space. Divide AE into four 3/16" spaces, with scale.…