1920s Cradle Mic Antique Brass Sleeve

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1920s Cradle Mic Antique Brass Sleeve

This topic has 6 replies, 6 voices, and was last updated 25 April 2025 at 09:40 by Michael Gilligan.

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24 April 2025 at 20:37 #794925
paulc1
Participant
@paulc1
Hi everyone,

I have purchased an Ellis Carbon Button Microphone from the 1920’s. It was supplied without a stand or base but it does have a short brass sleeve (17mm), with a diameter of 14.3mm. On this sleeve there is no thread at all and the cables run through the centre. What I need is an brass sleeve made up with a 5/8” thread on one end and the other end would need to fit the 14.3mm sleeve with a grub screw to hold it in place. Please see the attached drawing. On Amazon there is a listing for antique brass piping to cover radiator sleeves and this may be a good starting point.

Thanks,

Paul from South London, UK
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24 April 2025 at 20:51 #794943
JasonB
Moderator
@jasonb
The OD of your sleeve will need to be about 18mm as the 5/8″thread is just under 16mm major diameter. Those pipe sleeves are usually intended to slip over 15mm OD pipe so will also be larger and the bore will not go down to 14.3mm.
25 April 2025 at 07:23 #794987
Diogenes
Participant
@diogenes
Paul, as Jason says there’re inconsistencies in your dimensioning – aesthetically the part would probably benefit from having a step on it – have a think about the relative sizes and what shape you might want that transition / the finished part to look like.

From a ‘normal’ engineering perspective, this adaptor would normally be made from a plain cylinder of brass bar say 3/4″ (19.05mm) or so in diameter which would be within the run of normal ‘stock’ held by most people with the resources to make it in any case.
25 April 2025 at 09:06 #795007
Robert Atkinson 2
Participant
@robertatkinson2
Are you looking for someone to make this for you?
25 April 2025 at 09:24 #795018
bernard towers
Participant
@bernardtowers37738
unfortunately with those measurements you wouild have nothing left and it would not be metric
25 April 2025 at 09:30 #795021
JasonB
Moderator
@jasonb
It would be tempting to get a 5/8″ to 5/8″ adaptor and just make an insert. Probably bore out the thread from one end and Loctite in a simple bush. This would keep the cost down and simplify the making a lot.

If you do want it making then best to let the person have the two parts as the spigot on the mic is likely to be 9/16″ and if anything like camera mounts then the standard 5/8 thread is likely to be fairly slack
25 April 2025 at 09:40 #795024
Michael Gilligan
Participant
@michaelgilligan61133
Is this any help, stylistically ?

https://commons.wikimedia.org/wiki/File:Carbon_microphone,_c._1920s,_Ellis_Electrical_Laboratories_-_Museum_of_Science_and_Industry_(Chicago)_-_DSC06626.JPG

MichaelG.
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