Pipograph

When I first searched "pipograph", I found a place in Sao Paolo that is described by Google as "manufacturer". Then I found a description of the real Pipograph in the April 1916 issue of Heating and Ventilating Magazine: "...a unique calculator for figuring the net cost per foot of pipe." If you were reading Heating and Ventilating at the time, you could apply to its book department and, for just $1, a Pipograph could be yours.

This wheel is 8.875 inches across and is in pretty good shape, considering its age. The copyright date is 1915. The item right after the Pipograph mention is titled "New Magazine-Feed Boiler". If I were in that industry back then, no doubt this magazine would have been an invaluable resource. But I can't help but find amusement in some of the articles:

Window Leakage
Sidewalk Ventilation Gratings Disapproved
New York School of Heating and Ventilation Holds Fourth Annual Dinner.