CAMBRIDGE VIBROGRAPH, 1930's SEISMOLOGY/PHYSICS MUSEUM QUALITY, WORKING & RARE

CAMBRIDGE VIBROGRAPH, 1930's {SEISMOLOGY/PHYSICS} MUSEUM QUALITY, WORKING & RARE No C674942. This fabulous instrument, sometimes referred to as Seismograph is for measuring vibrations in the Earth's crust due to explosives being used in mines and quarries etc. This example is fitted in a photographic recording case (known as a dark room), with accessories.

The Vibrograph itself is located in the lower part of the mahogany case, cunningly held in place by the "geodesic" block of wood, clamped in place by the metal bar and knurled bolt. This mechanism is powered by a clockwork motor with variable speed control. A remote handle may be screwed into the Vibrograph for convenience. Access to the hinged mirror can be gained by removing the vibrograph. Electrical terminals are situated above handle mount and the original leads and fittings are stored in the case, adjacent.

The cables are in surprisingly good condition for their age and show no sign of perishing. There is a massive cylindrical weight stored in this compartment. By opening the other end of the case access to the dark room and batteries can be gained. A small trap door allows the frosted glass slide to be removed and the photographic plate to be inserted. Behind the frosted panel is a clear glass plate etched in 5mm squares. There is a lamp-house, celluloid strip device and a series of tools also fitted in this compartment. This is not just an attractive old piece of equipment, it is a serious instrument well ahead of its time made by the best instrument maker in the world.... Condition: the very best - pristine.

Overall dimensions d x w x h: 17 x 11.5 x 10.5 inches. THIS ITEM IS EXTREMELY HEAVY. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".

The seller is "chemistry63hg" and is located in this country: GB. This item can be shipped worldwide.

• Period: 1901 to 1950

---