W. M. Welch Scientific Company, est. 1906

Welch Scientific Company History - Galvanometer

Museum Artifact: Bakelite Galvanometer, 1960s

Made By: W. M. Welch Scientific Co., 1515 N. Sedgwick St., Chicago, IL [Old Town]

Research is underway on this one and a full write-up will be coming soon.

11 thoughts on “W. M. Welch Scientific Company, est. 1906

  1. A friend shared a picture of a poster that appears to have been distributed by W. M. Welch Scientific. The title of the poster is, ‘Chart of Electromagnetic Radiations’. Information on the poster shows that it was edited by Arthur H. Compton and complied by R. J. Stephenson and D. L. Barr. Can anyone tell me if this poster might be available and from whom?

  2. I am the great grandson of the company’s founder. Obtain a copy of an old Welch Scientific catalog. It will provide a wealth of information on the galvanometer and other equipment.

  3. I am now the proud owner of a under mount or “woodworkers” vise, barring the name, “W.M. Welch MFG CO”… here’s the REALLY interesting part (at least to me)… it also has “Chicago And Manitowoc” in its casting!! Not sure if this appropriate for this thread but this is some of very little information I can find on this manufacture!

  4. I have a bottle of Congo Red manufactured by W. M. Welch Scientific Company, Chicago, Ill.
    Please let me know what Congo Red was.

    1. Congo Red was a dye, originally developed and used to dye textiles, (mostly cotton) at one point, but phased out now for carcinogenic reasons. It is niw used primarily in histology (studying cells under a microscope) as it is water soluble and stains tissues differently depending upon pH. In acidic environments it maintains is bright red color, but turns blue when exposed to bases

      On a different note,, I have an old (still working) AC/DC Power Unit manufactured by W.M. Welch Scientific Co. Chicago. Iwas looking for jnfo on it, since I had it apart to add an on/of power switch and to replace the power cord that has cracked insulation and probably dangerous… That’s how I found this thread.

  5. I have come across an old Ulta- Glow lamp with 6 bottles of fluroesent paints. The bulb is dead. I was wondering if it is of value.

  6. I have a small tube corked of Litmus paper by Welch Mfg Co Chicago – paper inside looks pink – I am about to sell it if I can – does it have any value ? Thanks my dad was born in Chicago in 1913.

  7. My science teacher has this product from Welch company but she’s not sure what it is. I’ve taken the liberty of finding this info in case Idk it’s one of its kind or something. so the product in question is a metal instrument with a type of protractor on the bottom half of the stand and it has numbers on it that go from 10 to 180 both ways. and in the center of the device is what looks like the needle of a compass. it is approximately a centimeter in length and is red on one half and black on the other. might I get an answer on what this might be?

  8. Hi I have a Duo Seal vacuum pump serial # 3004-6 patent # 2337849. there is an another number on the body 1466-2. I need a motor for it and am not sure what size I need . Can you help me?

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