Workers using equipment on site

Workers using equipment on site

Workers using equipment on site

Worker using equipment on site

Workers using equipment on site

Workers using equipment on site

Worker using equipment on site

Worker using equipment on site

Worker using equipment on site

Young male surveyor looking through theodolite giving hand signal on construction site

Worker using equipment on site

Workers using equipment on site

Man singing using a microphone

Antique Engraving depicting Newtonian Physics confirmed by Experiments using Weights and Force., 1725

Antique Engraving depicting Newtonian Physics confirmed by Experiments using Pulleys, Weights and Force., 1725

Antique Illustration of Surveyer’s Quadrant (hand-colored copper engraving)

Flexible blunt probe used for insertion into vessels or ducts.

Firefighter uses a hydraulic cutter to begin removing roof from automobile.

Image showing ways of using a K-tool to break off door locks in order to gain access to an emergency scene.

Two types of scissors used for the dissection of delicate structures. A larger, heavy dissecting scissors about 15 cm in length, and a fine pair of scissors with two sharp points for dissection of delicate structures.

Antique Illustration (copper engraving) of Instruments used to measure Distance, Altitude, Arcs, Degrees and Positions of Topography and Celestial Bodies (theodolites or torquetums)., 1794

Antique Illustration of a Sixteenth Century Method for Milling Wheat Flour using the power of a few men, instead of wind or water power., Jacques Besson, 1578

Images showing ways of using a K-tool to break off door locks in order to gain access to an emergency scene.

As one person applies chest compressions to a newborn using both thumbs a second person is breathing into a pocket mask. The rescuer's thumbs should be positioned side by side on the middle third of the newborn's sternum, just below the nipple line.

Surveyor using a theodolite instrument