Bee consistency. Some solitary bees have advanced types of pollen-carrying structures on their bodies. A very few species of solitary bees are being cultured for commercial pollination. Most of these species belong to a distinct set of genera which are commonly known by their nesting behavior or preferences, namely: carpenter bees, sweat bees, mason bees, plasterer bees, squash bees, dwarf carpenter bees, leafcutter bees, alkali bees and digger bees. Most solitary bees nest in the ground in a variety of soil textures and conditions while others create nests in hollow reeds or twigs, holes in wood. The female typically creates a
Darby Steam-Digger Darby Steam-Digger The Darby Steam-Digger, a light traction engine, was invented circa 1879 by farmer Thomas Darby and built at Lodge Farm Pleshey, near Chelmsford in Essex, England. Robert Hasler, seen driving the Digger, helped to build this first prototype. In effect the machine was an early tractor designed mainly for ploughing, and could accomplish an hour (1 m²/s) to a maximum depth of 14 inches (360 mm). This first digger was constructed on pedestrian principles and had six "feet" and really did walk over the fields. Unfortunately it jumped too much to be really successful. The digger was later