The Fixation of Magnetic Phantoms.--With engraving.

VI. NATURAL HISTORY.--Researches on the Origin and Life Histories
of the Least and Lowest Living Things---By Rev. W.H.
DALLINGER.

VII. MEDICINE, ETC.--Case of Resuscitation and Recovery after
Apparent Death by Hanging.--by Dr. E.W. WHITE.

VIII. MISCELLANEOUS.--The Inventors' Institute.--Address of the
Chairman at the opening of the twenty-second session of the
Institute, October 2.

The New Central School at Paris.--3 engravings.

* * * * *

FLOW OF WATER THROUGH HOSE PIPES.

At a recent meeting in this city of the American Society of Civil
Engineers, a paper by Edmund B. Weston was read, giving the description
and result of experiments on the flow of water through a 21/2 inch hose and
through nozzles of various forms and sizes; also giving the results of
experiments as to the height of jets of water. The experiments were made
at Providence, R.I. The water was taken from a hydrant to the head of
which were attached couplings holding two pressure gauges, and from the
couplings the hose extended to a tank holding 2,100 gallons, so arranged
as to measure accurately the time and amount of delivery of water by the
hose. Different lengths of hose were used. The experiments resulted in the
following formula for flow from coupling:

1. For hose between 90 and 100 feet in length, and where great accuracy is
required:

---------------------------------------------------
/ 2gh
V = / ---------------------------------------------------
/ / 0.504 \
\/ 1 - 0.0256d^{4} + ( 0.0087 + ------- ) 0.12288d^{4}l.
\ --- /
\/ v

[TEX: V = \sqrt{\frac{2gh}{1 - 0.0256 d^4 + (0.0087 +
\frac{0.504}{\sqrt{v}}) 0.12288 d^4 l}}.]

2. For all lengths of hose, a reliable general formula:

----------------------------------------------
/ h
V = / ----------------------------------------------
\/ 0.0155463 - 0.000398d^{4} + 0.0000362962d^{4}l.

[TEX: V = \sqrt{\frac{h}{0.0155463 - 0.000398 d^4 + 0.0000362962 d^4 l}}.]

g being velocity of efflux in feet per second.
h, head in feet indicated by gauge.
d, of coupling in inches.
l, length of hose in feet from gauge.
v, velocity in 21/2 inch hose.

Forty-five