tached members of it the Bergmann brothers,
manufacturing for Mr. Edison in New York, and incessantly experimenting
for him. In addition there must be included Mr. Samuel Insull, whose
activities for many years as private secretary and financial manager
were devoted solely to Mr. Edison's interests, with Menlo Park as a
centre and main source of anxiety as to pay-rolls and other constantly
recurring obligations. The names of yet other associates occur from
time to time in this narrative--"Edison men" who have been very proud
of their close relationship to the inventor and his work at old Menlo.
"There was also Mr. Charles L. Clarke, who devoted himself mainly to
engineering matters, and later on acted as chief engineer of the Edison
Electric Light Company for some years. Then there were William Holzer
and James Hipple, both of whom took an active part in the practical
development of the glass-blowing department of the laboratory, and,
subsequently, at the first Edison lamp factory at Menlo Park. Later on
Messrs. Jehl, Hipple, and Force assisted Mr. Batchelor to install the
lamp-works of the French Edison Company at Ivry-sur-Seine. Then there
were Messrs. Charles T. Hughes, Samuel D. Mott, and Charles T. Mott, who
devoted their time chiefly to commercial affairs. Mr. Hughes conducted
most of this work, and later on took a prominent part in Edison's
electric-railway experiments. His business ability was on a high level,
while his personal character endeared him to us all."

Among other now well-known men who came to us and assisted in various
kinds of work were Messrs. Acheson, Worth, Crosby, Herrick, and Hill,
while Doctor Haid was placed by Mr. Edison in charge of a special
chemical laboratory. Dr. E. L. Nichols was also with us for a short time
conducting a special series of experiments. There was also Mr. Isaacs,
who did a great deal of photographic work, and to whom we must be
thankful for the pictures of Menlo Park in connection with Edison's
work.

"Among others who were added to Mr. Kruesi's staff in the machine-shop
were Messrs. J. H. Vail and W. S. Andrews. Mr. Vail had charge of the
dynamo-room. He had a good general knowledge of machinery, and very
soon acquired such familiarity with the dynamos that he could skip about
among them with astonishing agility to regulate their brushes or to
throw rosin on the belts when they began to squeal. Later on he took
an active part in the affairs and installations of the