Sketch of Dr. John Locke — Winchell. 343 
which he determined to make his abode for life. He estab- 
lished immediately a new school, long known by its high rep- 
utation, in which many of the present mothers of Cincinnati 
were his pupils. He was among the earliest instructors and 
lecturers in Mechanics' Institute, but the young mechanics 
went to his private apartments for instruction. He particu- 
larly excelled in making clear to his listeners the principles 
of chemistry and physics. They were inspired and attracted 
by his enthusiasm. He made with his own hand many of the 
instruments which he needed. 
In 1835 Dr. Locke was elected professor of chemistry in 
the Medical College of Ohio, and he entered upon his duties 
with the zeal of one having no thought of failure. He had 
been liberally patronized, and had been successful as a teacher. 
His associations had been adapted to his sensitive nature. 
All around were daughters, wives and mothers, sustaining by 
their intelligence and accomplishments his self-made reputa- 
tion. But his desire for more ample scope for the study of 
scientific problems induced him to sever the pleasant and re- 
munerative relations which he had sustained for thirteen 
years. 
The chemical department he found nearly destitute of every- 
thing needed for illustration. His own handicraft supplied 
many pieces of apparatus, but he finally visited Europe in 
1837, for the purchase of much more. The college rapidly 
rose in reputation and patronage, largely due to the renown 
which was spread abroad from the energy and popularity of 
the department of chemistry. We will not, however, pursue 
the course which Dr. Locke carried out in that institution, nor 
dwell upon his magnetical or astronomical researches, some of 
which proved of the greatest value to science. The chief of 
these was his "electro-chronograph," or "magnetic clock," 
which was pronounced bj T Lieut. Maury, of the National Ob- 
servatory, Washington, an invention of the highest value to 
the Coast Survey, "a national triumph, belonging to that class 
of achievements by which the most beautiful and enduring 
monuments are erected to national honor and greatness." For 
this signal triumph congress voted liini $10,000 in 1.S49, and 
the English government presented him a full set of niagneti- 
