Memoirs presented to the Cambridge philosophical society on the occasion of the jubilee of Sir George Gabriel Stokes, bart., Hon. LL. D., Hon. SC. D., Lucasian professor.

178 MESSRS GLAZEBROOK AND LODGE, EXPERIMENTS ON THE OSCILLATORY
Same date. Cylinder and disc again, with coil connexions reversed, otherwise everything the same.
Average of readings off all alternations on outer circle 60 13' 5",,"."~, " ". second circle 6~ 15' 5"
",,~,,",,,, ""third circle 6~ 1
", ~.......""~ fourth circle 6~ 17'
Speed for fourth circle was steadiest; weighted average 6~ 15'.
Frequency deduced 1830.
Same date. Leyden jar added to cylinder and dise condensers.
General average of readings 9~ 48'.
Frequency deduced 1180.
August 2. Took a spin with the large Muirhead condenser connected not to the
entire coil, but only one portion of it, the portion called B.
Average of readings (one spark on each circle) at 4-pattern speed was 49~ 40', but the
speed was not over steady, and with these heavy sparks the setting of the microscope on
a leading feature of each alternation is less definite.
Frequency deduced 232 or 233.
Same date. Same condenser joined to coil A.
Average of readings 50~ 10'.
Or omitting the last or drawn-out alternation, and taking the most probable average
from the steadiest circle:
Estimated reading 49~ 42'.
Hence frequency deduced, average 230;
most probable 232.
Same date. Muirhead condenser joined to complete coil, one spark attempted on each
circle, but one apparently missed fire.
Average of whole set (with 8-pattern speed) 45~ 15';
or frequency 128.
Same date. Muirhead with dise and cylinder condenser added.
Speed deduced 127 and 124.
August 3. Sheet glass condenser (glass as dielectric).
Composed of 8 sheets of glass and 9 of tinfoil.
Each tinfoil 38'1 x 54'2 centim.
Combined thickness of the 8 plates 2'2 centim.
Plate running at 6-pattern speed.
Average of readings 17~ 8'.
Frequency deduced 450.