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A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Black and White

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Color

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Outline

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Silhouette

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

Rotary lawn mowers were not developed until there were small enough and powerful enough to run the blades at high speed.

Rotary Lawn Mower

Rotary lawn mowers were not developed until there were small enough and powerful enough to run the blades…

"Double cylinder press, 1835-1900. These presses were built up to 1900 and this picture shows the latest design brought out about 1882." -Hill, 1921

Double Cylinder Press

"Double cylinder press, 1835-1900. These presses were built up to 1900 and this picture shows the latest…

"Single large cylinder press, 1832-1900." -Hill, 1921

Single Large Cylinder Press

"Single large cylinder press, 1832-1900." -Hill, 1921

"Single small cylinder press, 1835-1900." -Hill, 1921

Single Small Cylinder Press

"Single small cylinder press, 1835-1900." -Hill, 1921

"The design is to produce a continued stream, by simply turning it into a crank, thus converting the piston into cog-wheels and the vertical motion into a rotary one." -Comstock 1850

Rotary Pump

"The design is to produce a continued stream, by simply turning it into a crank, thus converting the…

"a, scroll-wheel, intermeshing with the pinion b, which, sliding by a feather on the shaft, c, imparts a gradually decreasing velocity to the latter as b is moved toward the center of a." -Whitney, 1911

Scroll Wheel

"a, scroll-wheel, intermeshing with the pinion b, which, sliding by a feather on the shaft, c, imparts…

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

Suction-pump

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

A type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. The common stopcock is the simplest form of rotary valve.

Rotary Valve

A type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow…