Page:Popular Science Monthly Volume 92.djvu/117

 \\"\v''.\' Equal density 'across'//'/ vv,\ •.•section of spray '/v

��Like Water from a Hose

��A method of Spraying Asphalt by hand — good for tight places

ANEW type of nozzle, made by a Boston manufacturer, is designed for spraying hot asphalt-binder in road construction or on sidewalks, where the use of a large rnotor-truck outfit would be unsuitable. The hot fluid is uniformly. •.,'•,,.. :

sprayed at a tempera- ture of 350 degrees Fahrenheit and at a pressure of forty pounds per square inch. The high pressure causes the asphalt to permeate all the voids between the stone, which it is in- tended to bind. The portability of the ap- paratus makes it possi- ble for this to be accom- plished easily. With a motor-truck it would be almost impossible to reach the corners.

The sprayer can also be used for patching holes in bituminous roads and for applying roof coatings'.

The asphaltic ma- terial is heated in the usual manner and put

���Unequal density v', across section \

��of spray

��Central drivinq jet

���Turbine cente rotated by ' force of asphalt

��Solid asphalt through center

��The nozzle has a turbine cen- ter which controls the density

��The asphaltic material is heated and applied un- der pressure from a gaso- line-driven rotary pump

��under pressure by means of a, gasoline-driven ro- tary pump. It is then carried to a special noz- zle by means of a hose. The nozzle has a fixed turbine center which disposes of the liquid in such a way that a dense uniform spray is ob- tained. This prevents the material from being too thick in some spots and too thin in others. The turbine in the nozzle is stationary, yet removable, and gives a part of the liquid pass- ing through it a rotary motion. This portion is driven out through the orifice of the nozzle by the central driving jet.

���The liquid asphalt is carried to the special nozzle through a hose. The nozzle sends it out in a solid conical formation of equal density across its section

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