Section of main pipe with pipes to upper museum, section (on line PQ for drawing number 146) showing junction of main with pipe to upper museum, plan showing method of securing ends of pipes, section (on line LM for drawing number 146) showing method of securing ends of pipes, section (on line IK for drawing number 146) of pipe to upper museum with its case &ce, section (on line AB for drawing number 146) showing junction of main width lateral pipes, section (on line CB for drawing number 146) showing lateral pipe with its case &ce, section (on line GH for drawing number 146) of lateral pipe showing mode of fixing its end, section (on line EF) of lateral pipe showing the method by which it is secured and rendered steady.  

On the front of the drawing: Note (not date): 'Dimensions of Pipes. The Several Pipes to be of the lengths shown in the Drawings. Stove Pipe to be 2 feet 1/2 in. Interior Diameter not more than 3/4 in. thick. Main Pipe to be 2 feet Interior Diameter and of the same thickness of Stove Pipe. Pipes to Upper Museum to be 1 foot Interior Diameter and not more than 5/8 inch thick Lateral Pipes to be 9 inches Interior Diameter and not more than 1/2 inch thick. Smoke Pipe to be six inches interior Diameter and not more than 3/8 inch thick and to have damper.'

On the reverse of the drawing: 144 written in black ink