X-rays simply explained : a handbook on the theory and practice of radiography / by R.P. Howgrave-Graham.

Date:
[1903?]
Catalogue details

Licence: Public Domain Mark

Credit: X-rays simply explained : a handbook on the theory and practice of radiography / by R.P. Howgrave-Graham. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    12/104 (page 8)
    LANATIONB 01 PI H ictricity, tl to drive an electric currenl through a resistant e oi against an opp I. M I The unit for its measurement is th<* It .— I-'li; • he direcl convei into light 8 other form of energy impai t«» .1 bodj hi m «ntt>i«It-, and can only last while the excit ing cause continue t,—The kathode o! ani piece t apparatus i- the electrode by which the currenl leaves it. v'. The mean free path of a gaseous molecule is the average distance t<> which it can move without coming into collision with other molecules. The word molecule literally Bignifie little mass, and, as used in this book, must have no further meaning attached t<» it. The ulti- mate Btate t division of the rapidly moving Btream which constitutes radiant matter cannot be dealt with here, and the terms particle and molecule must both be taken only in their widest —This term as applied t<> vacuum tube phenomena is used for the emission of light by certain Bubstanoes after the excitation •in*' ], sed; thus the glass of a 1: mtgen-ray bulb often continues to url<»w after the ion of the dischai. Radiability.—This is a term suggested by Mr Eyndman for the degree of penetrability or transparency of a substance to any given kind of radiation.