X-ray apparatus : complete outfits and accessories for X-ray laboratories (1908)
Kny-Scheerer Company · New York : Kny-Scheerer · leaf 54
G/..5923 G/..5923 Spark Gap, with scale, consisting of two hard rubber columns, one ofCode NEGHE which carries a metal disk, while the other is provided with a pointedmetal rod; one of the columns slides along the scale. For sparklengths up to 12 $10.00 G/..5924 The same, for spark lengths up to 20…
X-rays · Radiography
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