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Regarding specs for playing Edison cylinders, for archival purposes a 
selection of various sizes and shapes (conical, truncated eliptical, etc)
is preferred in order to get the stylus to 'ride' the least damaged or 
quietest area of the record groove.

However, here are links to the blue prints from the Edison factory for 
what was originally used.

http://www.edisonia.com/stylus/DiamondA.gif

http://www.edisonia.com/stylus/HStylus.gif


This site can better explain the groove geometry:

http://www.poppyrecords.co.uk/tec001/tec01.htm


And a link to an 'off the shelf' option if you already have a cylinder 
phonograph:

http://edisonia.com/Zen2/index.php?main_page=product_info&cPath=3&products_id=1

and a little info about the same:

http://www.nipperhead.com/old/act/


-Rob
www.edisonia.com








On 12/19/15 1:13 AM, John Haley wrote:
> Really?  I'm no expert on cylinders, but thought all cylinders played with
> a flat-bottomed stylus, the grooves being more like troughs, with the
> modulation being in the bottom surface rather than the groove walls.  i
> don't think you ever want to play a cylinder with a pointed stylus made for
> flat records.
>
> Best,
> John Haley
>
>
> On Fri, Dec 18, 2015 at 9:13 PM, Rob Lomas <[log in to unmask]> wrote:
>
>> Edison factory blueprints show the 4 minute stylus as 3.5 mil conical.
>>
>> -Rob
>> www.edisonia.com
>>
>>
>> On 12/18/15 8:15 PM, Overkill wrote:
>>
>>> I have been wanting to build myself an Archeophone for playing the common
>>> Amberol type 4 Minute Cylinders. I want to use a moving magnet cartridge
>>> and I am looking for suggestions as to which cartridge and needle size is
>>> best suited to fit the grooves correctly??
>>>
>>>
>>>
>>> Dave
>>>