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 Posted: Thu Apr 1st, 2021 03:18 pm
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Brent Rowell
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As a non-member I can't reply to your post about the Jost fan. I've been collecting, restoring, and studying these fans for over 30 years and can tell you exactly what you have. Only the early Jost fans from 1905-07 or so had brass blades which ran at a high speed (for a hot air fan) using a large gear on the crankshaft and a pinion on a secondary blade shaft above the crankshaft. Later models like yours (1910s-20s) were simplified and larger blades were driven directly from the crank at lower speeds. There were two models of these 'direct-drive' fan motors, both of which used the same bases or cast iron legs. The smaller motors had a 20" diameter aluminum 4-blade set while the larger motor (like yours) had 3 individually mounted blades which fit into sockets on a cast iron hub. These blades had a 32" span and were almost always aluminum and very rarely wood. So your fan should have these blades and a huge 33", 2-part cage made of brass tubing and rod as shown in the attachment.

Original lamps supplied with Jost fans were made by Ehrich & Graetz of Berlin. Hope this helps.

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LargeJost.jpg

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 Posted: Thu Apr 1st, 2021 03:24 pm
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Louis Luu
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Very nice!

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 Posted: Tue Apr 6th, 2021 09:22 pm
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Roger Lawson
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Thanks for the info Brent. So the brass blade that came on this fan when I purchased it is 17’ across and the hub screws onto the threaded shaft. Is this how the 32’ blades would have been mounted? Someone went to a bit of trouble to find the bleeds and hub to fit this fan. The blades do not look as though they are different from the hub to which they are attached. So you believe they raised the burner for what reason. Also there seem to be oil holes three different places with rounded covers that slip to the side for oiling. If that is what they are, what type oil should I use to service the motor. Once again ,thanks for sharing your knowledge.Roger

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 Posted: Tue Apr 6th, 2021 09:39 pm
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Brent Rowell
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Roger,
A lot of these fans came here via Ebay from India and sellers there often mixed and matched parts. You might have blades from one the earlier gear-driven Jost fans which have the same threads. But your fan would have had this cast iron hub with each blade attached to one of these brass brackets. When a lamp is raised up like that it means someone has tried to get more heat on the cylinder, maybe to make up for poor running. If everything is right it should run well with the lamp down on the triangular platform at the bottom. Use only a light oil like 3-in-1 or similar. Motor oil won't work. Oil the bearings and then a drop on the displacer rod and a few drops around the piston should do it. Hope this helps.

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IMG_3564.JPG

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 Posted: Tue Apr 6th, 2021 10:12 pm
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Roger Lawson
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Brent, I believe you are the man when it comes to these fans. I have been collecting for appox 30 plus years. Started with a guy in Dallas in the 80’s ,Kurt House. I have some pretty rare fans and always tried to keep them original. Disappointed this isn’t all there. Is it possible to restore this as close to original , such as a blade ? Quite certain cage would have to be fabricated.

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 Posted: Tue Apr 6th, 2021 10:25 pm
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Brent Rowell
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Roger,
I remember Kurt House. I started collecting hot air fans at about the same time, but I was in Thailand. I'm afraid it would be nearly impossible to restore this fan to original condition, more or less. The blades, hub, and brackets are impossible to find without buying another fan, and these days most of the fans that come up for sale are repros or a mix of old and new parts. The original lamp and chimney are even more rare than the fans. Cages can be made.

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 Posted: Wed Apr 7th, 2021 01:16 am
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Roger Lawson
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Brent, you are correct about the burner. My wife looked at bit and separated the burner from the extension some one had made. Now i will make a brass chimney and see if it will work. Stuck with this blade I guess and will look into fabricating a cage. Probably the best that can be done, what do you think?

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 Posted: Wed Apr 7th, 2021 01:55 am
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Brent Rowell
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Roger,
Have you tried running it first with the lamp elevated? There might have been a reason they put it up so high if it was having trouble running. I'd do that before making a new chimney, etc. That looks like an Aladdin lamp. You can run it that way and make a cage for your blades, but it was intended to push a lot more air with those big 32" blades. The original chimneys were green enameled steel (like the old "porcelain" signs) but I used to have replacements made from brass.

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 Posted: Wed Apr 7th, 2021 03:58 am
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Roger Lawson
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Brent,I really appreciate your sharing on this. If I have a question in the future, do you mind my contacting you? Thanks again.

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 Posted: Wed Apr 7th, 2021 12:26 pm
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Brent Rowell
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Roger, Sure, no problem. Just send me a PM and I'll send a phone no. and email.

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