had continued his teaching at the school in the
day-time; and he also taught on his own account the sons of gentlemen
in the evening: amongst others the sons of Dr. Wake and Dr. Belcomb,
both medical men. He was only making about 100L. a year, and his
family was increasing. It was necessary to be very economical, and I
was careful of everything. At length my uncle Milner agreed to advance
about 100L. as a loan. A shop was taken in Stonegate in 1836, and
provided with optical instruments. I attended to the shop, while my
husband worked in the back premises. To bring in a little ready money,
I also took in lodgers.

"My husband now devoted himself entirely to telescope making and
optics. But he took in other work. His pumps were considered
excellent; and he furnished all those used at the pump-room, Harrogate.
His clocks, telescope-driving[6] and others, were of the best. He
commenced turret-clock making in 1852, and made many improvements in
them. We had by that time removed to Coney Street; and in 1855 the
Buckingham Works were established, where a large number of first-rate
workmen were employed. A place was also taken in Southampton Street,
London, in 1868, for the sale of the instruments manufactured at York."

Thus far Mrs. Cooke. It may be added that Thomas Cooke revived the art
of making refracting telescopes in England. Since the discovery by
Dollond, in 1758, of the relation between the refractive and dispersive
powers of different kinds of glass, and the invention by that
distinguished optician of the achromatic telescope, the manufacture of
that instrument had been confined to England, where the best flint
glass was made. But through the short-sighted policy of the
Government, an exorbitant duty was placed upon the manufacture of flint
glass, and the English trade was almost entirely stamped out. We had
accordingly to look to foreign countries for the further improvement of
the achromatic telescope, which Dollond had so much advanced.

A humble mechanic of Brenetz, in the Canton of Neufchatel, Switzerland,
named Guinaud, having directed his attention to the manufacture of
flint glass towards the close of last century, at length succeeded,
after persevering efforts, in producing masses of that substance
perfectly free from stain, and therefore adapted for the construction
of the object-glasses of telescopes.

Frauenhofer, the Bavarian optician, having just begun business, heard
of the wonder