Now the Yerkes used two 42" reflector mirrors ground into 40" lenses.so perhaps wall did the same? The Webley Mars had such a violent recoil that the military people testing it in 1902 didn't want to fire it again! It was produced in 4 calibres the most notable being 8.5mm and .455 auto long.I the 8.5mm threw the bullets out at about 400 fps faster than a .357 magnum! About 1700 fps pretty formidable. But as Newtonian physics tells us for every action there's an opposite reaction.... Violent recoil!

 

I go small,got 4 25mm/1" telescopes now!counting monoculars as telescopes, which they are prismatic refractor telescopes. Lundt do a huge,and very pricey, solar telescope which is a refractor if I recall 13" the Yerkes 40" is still in use as is the 28" Greenwich refractor in London. I understand that you can't go bigger than the Yerkes due to light loss in the lenses,the glass weigh warping itself and the sheer weight atop a long tube.now image a 1" reflector!I'm guessing half the light gain of my 25mm pocket Borg? Anything under 25mm just doesn't grab enough light I find as I have a 10mm monocular although I must admit I've never tried the 20mm monoculars most of which are high quality brands like leica, etc..

 

What's the aperture of the weatheral refractor? Looks about 12" or there abouts, the wall would be double that.the weatheral looks a bit smaller than the 13" Grubb, built in Dublin, in Wellington, New Zealand. Although the New Zealand one is mounted in a dome and in a city which is fairly small,I'd guess 25000 souls,Auckland is 1 million.

 

Then it must have grabbed less light than an 8x25 refractor, mirrors being less effective than lenses. Modern coatings will further increase the transfer of light.the smallest reflector I have had is a 70mm sky watcher. It's a blue thing,looks rather like the famed edmundson scientific ball telescopes. It uses it's own brand screw in eye pieces. I think it's designed for children but I've read they are quite popular as a grab and go telescope with older folk.there's no way to collimate the main mirror.I've never had much luck with it.if I recall the eye piece is 30x and corrects the image for terrestrial use.1.25" eye pieces won't go in it.

 

Newton's would probably be OK on the moon but they say a reflector,like for like,has half the light gathering power of a refractor. That would put it slightly over my 5x10 Zeiss mini quick monocular. The only DSO's I've seen with the mini quick are,m13,m41,m44,m45,m31,m42 and various bright NGC objects in the southern hemisphere. They are all very dark through the 10mm objective.