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DOWLAIS,
_December 27th, 1876_.
DEAR SIR,—I have thoroughly tested the speculum, and am pleased to
tell you it stood its trials well.
Yours truly, D. C. C.
Mr. G. CALVER.
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ST. DENIES, SOUTHAMPTON,
_August 14th, 1876_.
DEAR SIR,—With reference to your enquiry as to the performance of
the 6-1/2 in. reflector. I have pleasure in stating that I am
perfectly satisfied. It readily divides the test objects and shows
delta Cygni with as low a power as 160. The comes to Sirius may be
considered an atmospheric test, perhaps, but I have repeatedly seen
it. Your stand I find very steady and convenient; altogether I can
fairly say that I consider that I have an instrument of considerable
power at a comparatively small cost. I now find the attempt to
observe with a refractor the reverse of pleasant.
The owner of a 3-inch refractor, after using my reflector, writes
that he envies me its power, ease, definition, and comfort in
observing.