\\"\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 



101 



