SEPTA cab signal display for the 4-aspect PRR system using position light aspects. Pulse code cab signaling is a form of cab signaling technology developed in the United States by the Union Switch and Signal corporation for the Pennsylvania Railroad in the 1920s.
Measuring your Saddle Seat Size. The easiest way to measure for the appropriate seat size is to measure your upper thigh. Sit in a chair with your feet flat on the ground so that your knees are bent at a 45-degree angle. Be sure your buttocks are touching the back of the chair. Take a measuring tape and run it along your thigh bone, measuring from the end of your knee to the backside of your buttocks.
Secure the chimney saddle. 1  Fit the chimney saddle around the back of the chimney. 2  Use a hammer and roofing nails to attach the saddle to the roof. Insert roofing nails into the saddle and roof every 6 inches (15.2 cm). 3  Place shingles over the flat part of the saddle.  Nail the shingles and saddle into the roof.