The system allows framed photovoltaic modules to be mounted exceptionally quickly and can now also be used on trapezoidal sheet metal roofs with thicknesses between 0.4 and 1.5 millimetres. Only a few ...

The trapezoidal shape is said to eliminate the possibility of the O-ring popping out, unlike standard round-shape O-rings that rely on being pinched by the groove retaining ring for seal retention.

Figure 1 You can implement this velocity-profile section in software that you can use to provide digital or analog motor control. Figure 2 You use subtraction to calculate the area under the curve ...

But this doesn't always work and O-rings can pop out. The Trap-Seal, a trapezoidal O-ring from Parker Hannifin Tube Fittings Div. (parker.com/tfd), eliminates this ...

Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. Otto Natzler began his career in pottery with his wife and collaborator, Gertrud Natzler. The pair created textured, ...