On June 7th he attended at the Visitation of the Royal
Observatory.--In a letter written in April to Lt.-Col. Marindin, R.A.,
on the subject of wind pressure there occurs the following remark:
"When the heavy gusts come on, the wind is blowing in directions
changing rapidly, but limited in extent. My conclusion is that in
arches of small extent (as in the Tay Bridge) every thing must be
calculated for full pressure; but in arches of large extent (as in the
Forth Bridge) every thing may be calculated for small pressure. And
for a suspension bridge the pressure is far less dangerous than for a
stiff arch."--In January he had some correspondence with Professor
Tyndall on the Theory of the "White Rainbow," and stated that he
thoroughly agreed with Dr Young's explanation of this phaenomenon.
--The following is extracted from a letter on May 1st to
his old friend Otto Struve: "I received from you about 3 or 4 weeks
past a sign of your friendly remembrance, a copy of your paper on the
Annual Parallax of Aldebaran. It pleased me much. Especially I was
delighted with your noble retention of the one equation whose result
differed so sensibly from that of the other equations. It is quite
possible, even probable, that the mean result is improved by it.
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