General fitness, health and nutrition · Public discussion

Re: Silva compass - Age ?

Started by Daytona · · Last activity · 3 posts · 334 views

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General fitness, health and nutrition
Published
17 May 2005
Last activity
18 May 2005
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Daytona
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  1. Roger said:

    It appears very similar to the type 2 illustrated other than it
    has a patent number rather than the reference to the US patent office
    and it lacks the instruction "read bearing here". These would both
    appear to be indications of something made for the American market.

    This one has the patent numbers for Sweden, US, Canada, Switzerland &
    Norway stamped into the bottom of the dial.

    Quoted message said:

    Are you sure the instructions originally came with that compass? The
    illustrations are of a type 3 with the later type of plastic ring.

    I'd noticed that they seemed to be generic instructions but hadn't
    taken in the plastic rings. The illustrations show an Explorer III
    Type 7NL and a Type 3 both with plastic rings. It also refers to a
    Type 5 so I presume that these are different types within the Explorer
    III range.

    The instructions could well be a later version, there's no way of
    knowing since it was picked up in a car boot sale. The box does have
    the number 2 printed on it though.

    Daytona

  2. The message <[email hidden]>
    from Daytona <[email hidden]> contains these words:

    Quoted message said:
    Quoted message said:

    It appears very similar to the type 2 illustrated other than it
    has a patent number rather than the reference to the US patent office
    and it lacks the instruction "read bearing here". These would both
    appear to be indications of something made for the American market.

    Quoted message said:

    This one has the patent numbers for Sweden, US, Canada, Switzerland &
    Norway stamped into the bottom of the dial.

    So has what is left of my type 1 but on the front it has what i take to
    be the british patent number. However I also have a broken type 5,
    smaller with a solid base, that was IIRC given to me by a friend in the
    vain hope that I could use the intact capsule in that to repair my
    broken type 1. That has the front hal o the plastic missing and is well
    worn but I can just about make out both the "Reg. US. Pat. off." and the
    "read bearing here" of your type. I can't see any year number. The only
    possible year number on my type 1 is the 60 stamped on the underside of
    the ring immediately after the Sweden in the address (no capsule). Ha,
    looking again at the posted intructions that 60 is part of the address.

    Quoted message said:
    Quoted message said:

    Are you sure the instructions originally came with that compass? The
    illustrations are of a type 3 with the later type of plastic ring.

    Quoted message said:

    I'd noticed that they seemed to be generic instructions but hadn't
    taken in the plastic rings. The illustrations show an Explorer III
    Type 7NL and a Type 3 both with plastic rings. It also refers to a
    Type 5 so I presume that these are different types within the Explorer
    III range.

    Quoted message said:

    The instructions could well be a later version, there's no way of
    knowing since it was picked up in a car boot sale. The box does have
    the number 2 printed on it though.

    If the compass does date from 72 then the instructions could well be
    current. My type 3 which retired a couple of years ago with a leaking
    capsule says MN 74 which might just be the right date although I
    wouldn't discount the possibility (unless anyone knows for certain) that
    the number refers to the Magnetic Inclination Zone.

  3. Roger said:

    If the compass does date from 72 then the instructions could well be
    current. My type 3 which retired a couple of years ago with a leaking
    capsule says MN 74 which might just be the right date although I
    wouldn't discount the possibility (unless anyone knows for certain) that
    the number refers to the Magnetic Inclination Zone.

    Looks like the letters denote the MIZ - MN standing for Magnetic North
    <URL:http://www.silva.se/catalog/comp_parteng.pdf>.

    The codes for the other zones are -

    NME - North of Magnetic Equator
    ME - Magnetic Equator
    SME - South of Magnetic Equator
    MS - Magnetic South

    The letters (if any) after the model type are model number features -

    E - Battery illuminated
    LU - Luminous points
    NL - Non-Luminous
    D - Declination scale

    Daytona

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