To determine the precise quantity of lime water
requisite, add the reagent (saturated solution) to a small portion (of
known volume) of the freshly drawn water, in small quantities at a
time, and with constant stirring until no further precipitate forms.
Then by a simple operation in proportion the quantity of the reagent
necessary for the purification of a given quantity of the well water
may be easily determined. An excess of the reagent must be avoided.
This impurity would probably prevent the successful working of an
injector.
W.S.W. asks: How is the best rosin, used on violin bows,
prepared?--W.F. asks: What is a simple method for washing clay for
brick and tile making?--E.S.D. asks: What is the best kind of wood to
construct a guitar?
* * * * *
COMMUNICATIONS RECEIVED.
The Editor of the SCIENTIFIC AMERICAN acknowledges, with much
pleasure, the receipt of original papers and contributions upon the
following subjects:
On Rheumatism. By A.R.E.
On Postage Stamps. By E.B.
On Boiler Explosions. By G.B.B.
On Reaching the North Pole. By J.H.S.
On Heating Street Cars. By P.T.
On a Hybrid Fruit, By R.
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