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Signalling Telescopes
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> Canada
> Army
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> Visual
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[Thanks to Mick Burmeister for his research material. Information partially from "Notes on Repairs to Fire Control Instruments - Part 42 - Service Telescopes & Periscopes" from the Military College of Science, 1941 for Mks. IV to VII]
The Mk.IV was introduced in Feb 1915 although there was no obvious visible difference between the Mk.III and Mk.IV [exact differences are unknown, telescopes from Mk II to VI look superficially indistinguishable]. There was later an alternative body design introduced as the Mk.IV* [the asterik indentifying a change in design that did not warrant a new Mk designation] in Oct 1916. It's also apparent that introduction of a new mark didn't immediately supersede earlier ones still in production, as Mk.IIIs have been found dated 1917.
The Mk.V was introduced in Nov 1916. Reading between the lines of an exchange of memos between WD Inspection at Woolwich and the prime contractors Taylor, Taylor & Hobson of Leicester, it's clear that this was a significant design change from other marks and a complete lemon from the service point of view. There appear to have been 4 individual slot-in lenses issued with it instead of the 2 eyepiece assemblies, giving 16 possible configurations only 2 of which were correct! Certainly a nightmare and, if this information is correct, little wonder that I've not heard of an existing Mk. V.
The Mk.IV was reinstated for future mfg. in April 1923, and in Jan 1926, the Mk.VI was introduced. This seems to have been identical to IV except that 'moderating glasses' (neutral density filters) replaced the plain metal swivel shutters in the eyepieces, and existing Mk.IVs were upgraded to Mk.IV** by retrofitting the same modification to them.
In January 1939, further mods to IVs and VIs swapped a vulcanised rubber covering and webbing straps for the earlier leather when they passed through Woolwich for repair. I haven't seen any like this, nor have I seen or heard report of a Mk VII. All models were obsolescent in Aug 1939. |
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