India Rubber and Gutta Percha and Electrical Trades Journal. Vol. 4, No. 4. (Nov. 8, 1887)

              THE
India=Rubber and Gutta=Percha
AND
ELECTRICAL TRADES JOURNAL.
VOL. IV., No. 4. NOVEMBER 8, 1887. PRICE
ONE SHILLJNG & SIXPENCE.
OOnSTTEITTS.
On the Technology of Rubber Sub­stitutes
.. .. .. ..
NOTES BY "QUIZ"
Loofah ..
American Rubber Trade .. ..
Origin and Progress of the India-
Rubber Manufacture in England
New Waterproof Composition .
Action of Molten Lead on Rubber
LEADING ARTICLE. — Foreign
Clerks .. .. ., ,.
NEW INVENTIONS, NOVELTIES, &C.
Galloway's Compound Electric
Light Engine .. .. ..
Sketch of the Elastic Web Trade
of Leicester .. .. ..
ELECTRICAL NOTES ..
Euphorbia Gum .. ..
The Adelaide, S.A., Exhibition ..
New Companies .. .. ..
A Lady's Opinion of Waterproof
Bonnets
New Patent Law, &c
73
77
78
79
80
•83
83
85
86
90
91
92
93
94
94
95
PAGE Clark, Sons & Co PAGE XV.
Clayton Aniline Company .. xi.
95 Clouth, Franz .. ..
95 Cohen, B. .. .. .. .. XV.
Dukes, Bernhard .. .. .. 96
Elrick & McPherson .. .. xviii.
Eschmann, Bros., & Walsh .. xiv.
Fleming, David .. .. .. xiv.
XX. Forster & Gregory .. ., .. 84
vi. Frankenburg, Isidor ., .. ii.
xi. Frankenstein, P., & Sons .. .. viii.
iv. Freudenburg, F., <fe Co. .. . . XV.
xviii. Garnock, Bibby & Co. .. .. iii.
xvii. Galloway, W. & J., & Sons .. iii.
xiv. Glasgow & Laing .. .. .. xiv.
xviii. Hancock, Jas. Lyne .. .. 80
iv. Hutchinson, A., & Co. .. .. xvii.
ix. Kindersley & Johnson ., .. xix.
xvi. Laird & Alexander.. .. .. xiii.
iv. Ledger, Wm... .. .. .. xiv.
xiv. Liverpool Rubber Company .. viii.
V. Loewenthal & Morganstern .. xvi.
xviii. Macalister, J. & R .. 96
96 Manders, Albert S,, & Co... .. 96
CORRESPONDENCE—Vulcanising Air
Cushions .. .. ..
BANKRUPTCIES, &C. .. ..
ADVERTISEMENTS.
Abbott, Anderson & Abbott
Adkin, Thos., & Sons ..
Armitage, Sir E., <& Sons ..
Arnott & Button .. ..
Bailey, Wm., & Son ..
Barnes, W. C., & Co. ..
Barrow, Franklin .. ..
Bartrum, Harvey & Co, ..
Beldam Packing Company
Birnbaum, B. .. ..
Black, J. W
Brown, W. L. C. .. ..
Cambrian Rubber and Leather Co.
Canfield Rubber Company
Carless, Capel & Leonard..
" Ceramyl"
[Where the numerals are omitted the advertisement does not appear in this issue.]
Mandleberg, J., & Co. .. PAGE viii.
Markus Harris .. ». .. vi.
Mills, John .. .. iv.
Moseley, David, & Sons .• .. 84
Nichols, John .. .. .. xiv.
North British Rubber Company ,. x.
Patent Door Buffer Company .. xvii.
Pirelli & Co... .. .. v.
Reddaway, F., & Co. .. .. xix. •
Robinson, Jos., & Co. .. xv.
Rossendale Belting Company .. xvi.
Rowley, Thos., & Co. .. .. vi-
Rothwell, John .. .. ix.
Shaw, Francis .. .. .. xii.
Smith, Alfred .. .. xii.
Smith, John .. .. .. xii.
Thompson, Samuel.. .. .. xiv.
Tomey & Sons .. ., .. xii.
Tuck & Co .. .. XX.
Typke & King ., .. .. x.
Victoria Rubber Company .. x.
Warne, Wm., & Co. .. .. i.
Wertheim, Louis .. .. .. v.
Worth, T., & Co iii.
ON THE TECHNOLOGY OF RUBBER
SUBSTITUTES.
BY W. LASCELLES-SCOTT, M.S.A., &c.
Lecturer on Chemistry and Physics to the London Conservatoire of Mustc.
Formerly Manager Horseley Fields Chemical Works
Wolverhampton.
(^Continued from page 52.)
^
THE "REACTION" OF "EUPHORBIA GUM."
Y this term I do not mean to refer again to
resinoid acid or acids previously alluded
being normally present in " E. G.,"
3- moment upon a charac­teristic
which is noticeable for one or two
reasons, not the least important of these
being the fact that a very simple experiment J f suggests a point of some practical value in
relation to the subsequent manipulation of the gum.
If any convenient quantity of E. G.—preferably taken
from the inner part of the potato-like nodules described
last month—be carefully powdered and macerated in
successive portions with a comparatively small bulk of
cold distilled water,* it will generally be found that the
latter, when separated from the gum and filtered, is no
* This must be freshly drawn over, perfectly neutral, and should give
no marked colouration with " Nessler's Reagent."
longer absolutely neutral. The ordinary " test-papers "
indicate the presence of a little acid of some kind ; and,
varying the experiment somewhat, if the powdered E. G.
be immersed in a large quantity of water—or, better still,
be subjected to the action of a continuous slow current—
for some days, a stage will be reached whereat the gum,
taken out of the washing current and rubbed up with a
small quantity of pure water for any length of time, will
no longer yield an "acid " filtrate. In this connection it
may be observed that not only do different parcels of
E. G. exhibit very great variations in their respective*
"acidifying" powers, but this difference is to be found
even amongst the individual nodules contained in a single
package. Some illustrations of this fact will be given in
a tabular form before the conclusion of this series of
articles.
Now for the practical lesson to which the foregoing
necessarily leads :—If equal weights of raw and well-washed
E. G.—both, however, being freed from all traces
of adherent and occluded moisture—be separately mixed,
or, in other words, " masticated," with similar proportions
of pure rubber, and subsequently manipulated in any of
the various ways perfectly well-known to all the readers
of this journal, the resulting products, although they may
have been treated in the same manner side by side with
scrupulous exactitude, will not be alike by any means.
Some of the differences are so marked that I think they
will not be wholly uninstructive if I exhibit them in