the floor to allow an operator to load the product with minimum body strain as the product is continually loaded onto the platform 39 the weight of the product increases causing the air within the cylinder 32 to become compressed consequently the height h of the product remains relatively constant as best seen by now referring to the automated assembly 10 shown in fig3 the platform 39 and the original work product 41 has dropped to the position indicated while the last work product 41 39 is at the same height h as with the original product when the last work product 41 39 is next removed from the platform 39 the force exhibited by the totality of products 41 41 39 continually decreases allowing the platform to raise continually until the original work product 41 and the platform 39 return to the positions indicated in fig2 the three way valve serves to increase the pressure to the cylinder 32 of fig2 or decrease the pressure depending upon the density of the particular work product being loaded and unloaded from the platform 39 after the original pressure is determined the valve 38 is set to the off position to prevent air from entering or leaving the cylinder thereby allowing the pressure in the cylinder to change and remain in equilibrium with the changing weight of the work product the three way valve also serves to adjust the pressure to the cylinder to compensate for the particular work product density as well as to compensate for the non linear relationship between the changes in the weight of the work product and the resisting force provided by the compressibility of the gas in accordance with boyle 39 s law in factory environments when the.