Question on Malcolm telescopic sights

This isn't a real firearm obviously, but it is related to old and antique weaponry. And it's really simple... why is the Malcolm sight so damned long? Was it limitation in manufacturing the lenses, was it just intuition that made the designer? What's the advantage of having such a long scope?
 
Limitations in lens grinding and mounting. Not many lenses in a 19th century scope, a modern short scope is full of glass.
 
Grinding wasn't the big issue, they didn't have the high-refractive-index low-aberration glass we have today. You needed very thick lenses with old glass, and the color fringes were bad.
 
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