W.F.Sprengnether Portable Seismograph Instr., w/OrigBox

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  • Item Category: Tools
  • Source: eBay
  • Sold Date: Nov 28,2007
  • Channel: Online Auction
W. F. Sprengnether Portable Seismograph Instrument (We believe this instrument to be a seismograph for determining intensity of earthquakes - this company also made instuments for detecting and tracking hurricanes) We found the instrument in its original box. The instrument measures 5-1/4" wide x 1-5/8" thick, flat sides are 3" high from base - This arched form houses a scale with a center apex reading zero - scale goes each way from zero (10 to 90)- five equal spaces marked off between each section (total space in each section is equal to 3/8") Below scale is a 1/4" opening that allows device to show tremors - from left a black metal point, from right a red indicator point, The indicators appear very sensitive (when small magnet is placed on either side of device, the indicators swing smoothly and freely over scale. On surface of other side is W. F. Sprengnether, Pat. Applied For, St. Louis, Mo. - on left a large S, on right a large N. Instrument is made of heavy, non-magnetic metal - 1/4" thick. Heavy, inset screw/bolts keep the two sides together - device made portable by 52" old woven cord, attached to two metal, swivel pieces of metal, shaped like a triangle. Original box measures 5-3/4 wide x 4" thick x 5-3/4" high - all eight corners have sturdy steel corner brackets, riveted to box - snap-lock marked Excelsior, Stanford, Conn., keeps box securely closed. Condition of seismograph is excellent, clean, tight, and working. Condition of original box is solid, with exterior roughness all over - leather handle is broken, metal corners uniformally light rust, one red side, outer layer of fabric missing - interior felt lined (accompanying picture shows felt loose-this has been reglued) bright red felt shows age and light wear - has space to keep instrument secure when packed - has room for shoulder cord. Believe this seismograph could be from c 1930's.

We have just found out from a bidder that this is actually a dip meter. The magnetic field points like an arrow in three dimensional space. A normal compass points to the projection of that arrow in the horizontal plane. To get the direction of that projection on the vertical plane a person uses a dip needle. Condition of dip meter is excellent, clean, tight and working. Condition of original box is solid, with exterior roughness all over-leather handle is broken, metal corners uniformally light rust, one red side, outer layer of fabric missing--inerior felt lined (accompanying picture shows felt loose-this has been reglued) bright red felt shows age and light wear-has space to keep instrument secure when packed-has room for shoulder cord. Believe this could be from the 1930's. Instrument has a screw in the back to lock the indicator so it will not get damaged when not in use.

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