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Vintage 1970 FRAHM / BIDDLE 31-J Resonant Reed TACHOMETER in Leather Case, US $1900 – Picture 0
Vintage 1970 FRAHM / BIDDLE 31-J Resonant Reed TACHOMETER in Leather Case, US $1900 – Picture 0

Vintage 1970 Frahm / Biddle 31-j Resonant Reed Tachometer In Leather Case

US $1900

  • Sequim, Washington, United States
  • Jun 22nd
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Vintage 1970 FRAHM / BIDDLE 31-J Resonant Reed TACHOMETER in Leather Case This TACHOMETER is in Great Condition! o---------------------------------------------------------------o Resonant Reed TACHOMETER in Leather Case A Well Cared for Tach Made By: FRAHM / BIDDLE Year: 1970 Item Info: This is a really nice vintage (1970) Portable Tachometer in its original thick leather carrying case. It also has the original instructions! Works perfectly, and has no damage or repairs. Description The tachometer consists of a grey cast aluminum box containing an array of tuned steel reeds which differ in length and thus in natural vibration frequency. When the device is held against the casing of a vibrating machine, the reed that matches its vibration frequency will be observed to vibrate much more than the others, as it resonates with the machine. The frequency, in hundreds of revolutions per minute, can be read from one of the scales. Markings Above the scales: RESONANT REED FRAHM TACHOMETER. Each letter of the name FRAHM. Below the scales: JAMES G. BIDDLE Plymouth Meeting PA., PAT. NO. 188,345. Dimensions: 6.75" W x 3.125" H x 3.125" D (Case) Comes exactly as shown in photos. A Perfect Addition to Any Equipment Collection! Comes from a smoke free home. (scroll down for photos) Since a Picture is worth a thousand words, I do consider the photos of this item to be part of the Description. I pride myself on my 'Feedback'. If you wish to bid with confidence, Read my buyers feedback, and Bid with confidence. Please feel free to ask any questions about this item before bidding and I will be happy to chat with you. Shipping Weight: 3 Pounds (well packed) All Packages Ship Insured! (This is Included in S/H) Buyer must respond within 3 days and Items must be paid within 7 days. PLEASE take the time to read all the info in this auction, and contacted me with any questions prior to Bidding, as it will only cause problems if its left until after the auction is over. Thank You for Visiting and Happy Bidding! Buyer must respond within 3 days and Items must be paid within 7 days.  _gsrx_vers_566 (GS 6.7.1 (566))

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