...what else?...well, bullion is associated with 'silver and gold' too, isn't it?....go figure:

 

 

 

https://en.wikipedia.org/wiki/Crown_glass_(window)

 

life was no 'bed of roses' eh, lisa?

 

 

and what about 'crown glass optics'?

 

https://en.wikipedia.org/wiki/Crown_glass_(optics)

 

oh I remember now...if you want to understand what 'little colin' et al, are up to...on the 'sooty and sweep' line...then you have to know...that he had been given a rather 'special' telescope, as a child...a tel-e-scope....go figure:

 

 

https://en.wikipedia.org/wiki/History_of_the_telescope#Achromatic_refracting_telescopes