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Radio-Active Substances

Chapter 55: TRANSCRIBER’S NOTES
By Marie Curie
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About This Book

The author presents a systematic account of experimental investigations into radio-active substances, tracing early observations of penetrating emissions from uranium compounds and the methodological shift that treats radioactivity as an atomic property. The work describes the isolation and chemical preparation of a highly radio-active element and its salts, procedures for determining its atomic weight, and comparative measurements across related substances. It also reviews contemporaneous physical studies on emitted radiations, experimental techniques, and unresolved questions, offering both detailed laboratory results and a concise survey of the field's developing problems.

RADIUM
ON SALE AND LET ON HIRE.—Write for Terms.
The following can be had by return of post.

Pitchblende, direct from Joachimsthal, very radio-active, from 1/- to 30/- per piece.

Itacolomite, or flexible sandstone, 10/- to 25/- per piece (very rare).

Kunzite, 1/- per gramme. Selected, clear, 2/-

Sparteite (see Nature, 31 3/04, fol. 523), 2/- and upwards.

Chlorophane, 2/- and upwards. Barium Platino Cyanide in large Crystals in course of manufacture. (Orders Booked).

Zinc Sulphide. Phosphorescing a beautiful Green, 2/6 per tube.

Zinc Sulphide. Phosphorescing a beautiful Yellow, 2/6 per tube.

Calcium Sulphide Phosphorescing a beautiful Violet, 1/- per tube.

Radio-active Residue from which Radium is made; very scarce, 2/- tube.

Polonium Sulphide, in tubes of one gramme, 21/-

Polonium on Bismuth Rod or Disc, 25/-

Polonium on Copper Rod or Disc, 25/-

Radio-active Screens (Willemite), 6d. per sq. inch. Plat. Bar. Cyan Screen., 9d. sq. inch

Radio-active Screens (Zinc Sulph.), 10 × 10 cm. 7/6.

Professional Men, Universities, Schools, &c., allowed special terms.
Our newly invented Thorium Inhalers may be had on hire.
ARMBRECHT, NELSON & CO.,
71 & 73, Duke Street, Grosvenor Square, London, W.
Telephone: Gerrard 4942.

N.B.—We have to-day received a consignment of the New Zealand Vegetable Caterpillar; it is from 2 to 3 inches long, with a stem showing fructification growing out of its head. Scientific name of the insect is Hepialus virescens; the name of the fungus is Sphaeria Robertsiana. Specimens may be had from 10/6 to 21/-, according to quality and size.

TERMS CASH WITH ORDER.
Goods may be returned if not approved of, when money will be refunded.

TRANSCRIBER’S NOTES

  1. Silently corrected typographical errors and variations in spelling.
  2. Anachronistic, non-standard, and uncertain spellings retained as printed.