Sighting telescope question ~

[Gspragge]

Does anyone know what a "Variable Power Telescope" No 2 MK1 1917 would be used with ?
I have a list for ww2 types, but information on older types is lacking.
This one sold in a local auction tonight for $100 pus commisions.

 

[Gspragge]

All is revealed - https://archive.org/details/in.ernet.dli.2015.278757/page/n27/mode/2up
or better I bought the book -

 

[Gspragge]

This is for sale over here, I rather suspect it is too costly - Am I correct ?
$375 = PS 216L

Well this answers my own question ! and it'a a better example ~

WW1 British Artillery Sighting telescope No4​

Regular price£184.00 GBP