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Thread: S.I.S ??

  1. #1
    Join Date
    Feb 2016

    S.I.S ??

    I recently acquired some drawings of various G45 gun cameras and mounts and variants and was wondering what the S.I.S stands for ??

    Serious replies only please

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  2. #2
    Join Date
    Jul 2008
    West Sussex
    This is a guess - assuming that every piece of equipment would have needed at least one or a series of technical drawings to be made prior to being produced and that all of those would have been centrally stored, it would be logical that each piece of equipment/set would be allocated an Index number and that all equipment drawings would be found via reference to a card or filing cabinet index. So perhaps S.I.S. refers to 'Sheet Indexing System'?

  3. #3
    Join Date
    Feb 2016
    Ok thanks, sounds reasonable.

    I was thinking along the lines of "specification info/index? sheet" ??

    some more reference pics of other related sheets if helps, I missed out on these.

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  4. #4
    Join Date
    Feb 2010
    20 Km south of LFBN, France
    Service Installation Schedule? They look like lists of items required for service installation of modifications or alterations. I note that they include the mod number & approval by committee date. I've not come across that before as I was usually involved in Alteration leaflets, which have the items listed and/or drawings required. SRIMs (I think Service Radio Installation Modification) would be similar to alteration leaflets, but a 'full blown' modification could need that type of listing.

  5. #5
    Join Date
    Feb 2016
    Example of the type of drawings

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  6. #6
    Join Date
    Jan 2008
    The definition of S.I.S. is Standard Instruction Sheet, as found in a volume of Standardisation Design Memoranda.

    The SDM initiative seems to have been an ongoing attempt to produce a definitive list of standardised equipment, to be incorporated in all new and future designs, i.e. to eliminate a profusion of different bits of equipment, all capable of doing much the same job.

    Whether the S.I.S. is part of this initiative or whether it pre-dated it I cannot say.
    The garage that keeps on giving

  7. #7
    Join Date
    Feb 2016
    Thank you Air Ministry, appreciate the feedback as with others who replied, gives a better understanding of the use of the drawings.

    Two sheets in particular caught my eye depicting both the Williamson dummy and original Vickers K guns with G45B camera variations fitted as listed in the equipment schedule above with others.
    Possibly used with our FN11 turret as it was fitted with a camera circuit.

    Will be scanning these for future reference asap as the originals are quite fragile.

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