IMPROVED MAGNETO-ELECTRIC MACHINE
Daniel Davis
1848
 

Also contained are two rosewood handle accessories for medical-electric use. Described in Manual of Magnetism pg 277 fig. 174 (2nd ed).

IMPROVED MAGNETO ELECTRIC MACHINE
W.C. & J. Neff,
1850-1860

 Signed on inner lid of mahogany box measuring 11-1/4" x 5-3/4" "W.C. & J. Neff, Philadelphia. No. 3 1/2 South Seventh Street;" note two (painted red and green) horseshoe magnets with red coiled electromagnets.  Neff was at this address in the 1850's.

IMPROVED MAGNETO-ELECTRIC MACHINE
W. C and J. Neff,
1870

 Signed "W. C and J. Neff, Philadelphia. 11-3/4" x 5" mahogany box; with one green painted horseshoe magnet and red coiled electromagnets. Neff was at this address in the 1860's and 1870's.

DAVIS AND KIDDER'S PATENT MAGNETO-ELECTRIC MACHINE
Ariel Davis
1854

 Signed and patented by Ariel Davis in 1854 (brother of Daniel Davis). An early example of this machine, signed on paper label inside lid as well as on interior brass frame and on top of mahogany wooden box.  Machine is complete with early rosewood and brass handles; horseshoe magnet is painted red and the electromagnets are covered in red felt; all indicators of early manufacture.

MAGNETO-ELECTRIC MACHINE
 Signed "Davis'
ca. 1850

Improved and Compound Magneto-Electric Machine for Medical Purposes, Ashael Davis, Lowell, Mass, Box 509". Very similar to the "Davis and Kidder's" machine but with gold and purple label on inner lid of box which measures 10" x 4-1/2" (h). This machine predates Davis and Kiddler and was patented by Daniel Davis' brother. Very fine condition, circa 1850.