[Amps] cooling chimney?

[Stirling Schmidt]

Hi all:
    Here are 2 off-the-wall ideas:  Can clock-type glass domes (with hole cut in top) be safely used for chimneys to fit antique globe shaped tubes like RK65/5D23, 304TL, 250TH?  Also, what if cooling air is introduced inside a chimney via a 90-degree elbow or 2, so as to cause a 'swirl', and increase cooling efficiency?  Any thoughts appreciated...
Stirling Schmidt KC0NXM