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INDIA-RUBBER COURT-PLASTER. 
ART. XII.— INDIA-RUBBER COURT PLASTER. 
By Mr. B. C. Rowland. 
The Pharmaceutical Journal, No. IV., 1st Vol. contains 
an article detailing the manner of making Mr. Liston's isin- 
glass plaster, spread either upon silk or membrane. I am 
induced to lay before your readers, in furtherance of the 
same subject, the best method of making India-rubber Court- 
plaster, which does not wash off; thinking, as it has become 
an article now in general use, that the mode of its prepara- 
tion may interest the Chemist and Druggist. 
A stout frame of wood must be made about three yards 
long, (or any length that would be most convenient,) and 
about one yard and a quarter wide. Within this frame 
must be placed two sides of another frame running longitu- 
dinally and across, so fixed in the outer frame that the two 
pieces may slide, independently of each other, backward 
and forward about six inches. 
Tapes of canvass must be tacked round the inside of the 
inner frame and the corresponding sides of the outer frame, 
so as to form a square for the material to be sewed in ; 
which when done, the two loose frames must be drawn tight- 
ly to the outer, by means of a twine passed round each, in 
order to stretch, perfectly free from irregularities, the silk or 
satin previous to laying on the composition. 
To make the India-rubber plaster: — Dissolve India-rub- 
ber in naphtha, or naphtha and turpentine, and lay it on 
with a brush, on the opposite side to that intended for the 
plaster, and when perfectly dry, and the smell in a great 
measure dissipated, it will be ready for the adhesive mate- 
rial ; to make which — take equal parts of Salisbury glue, or 
fine Russian glue, and the best isinglass, dissolved in a suffi- 
