Originally Posted by
Self loading bear
I hope i do not drift to far off course of this thread, but I hope somebody can point me in the right direction?
Photo below is from a book of 1931 "In de schroefwind" of KLM pilot A. Viruly.
It is a photo of two gasholders in Leeuwarden (now the Bleekhof in Leeuwarden)
The arrows point roughly North while the Leeuwarden air base is approximately 4 km in NW direction.
Did they have already have a flight pattern in place?
It's strange to actually paint the arrow on top of the gas holders as they spiral round as they go up and down as the gas fills/empties. If you look closely at the mechanism you will see this.
The ones for London/Northolt are a design that has a static casing on the outside of the gasholder.