> as lemmas

1867 R. S. Culley Handbk. Pract. Telegr. (ed. 2) ix. 184 Siemens' relay consists of an electromagnet of the usual horse-shoe form.

1879 Telegr. Jrnl. 7 318/2 (heading) Siemens' electric lamp.

1879 Telegr. Jrnl. 7 412/2 (heading) Siemens' differential electric lamp.

1882 Encycl. Brit. XIV. 633/1 In the Siemens differential lamp,..a potential or shunt coil and a current coil oppose each other; as the arc lengthens the current becomes less, and the potential greater, each acting to cause the carbons to approach.

1884 H. R. Kempe Handbk. Electr. Testing (ed. 3) xii. 284 Like galvanometers, the Siemens electro-dynamometer is not susceptible of great accuracy when readings are very low.

1886 J. Maier Arc & Blow Lamps v. 40 A large Siemens' dynamo at 450 revolutions after two hours' work became so hot that the electro-magnets began to fire.

1892 W. P. Maycock Electr. Lighting I. v. 122 Siemens' wattmeter is very similar in appearance to the electro-dynamometer.

1900 Knowledge 1 Dec. 281/1 An ordinary Siemens telegraph relay.

1912 Motor Man. (ed. 14) iii. 125 The Siemens metallic tungsten lamps are practically unaffected by shock.

1922 R. Glazebrook Dict. Appl. Physics II. 4/1 If the current measured passes through both coils the scale division will approximately follow a ‘square law’, as in the case of the Siemens dynamometer.

1927 S. H. Long Navigational Wireless v. 86 (heading) Instructions for operating the Siemens direction finder.

1930 T. E. Herbert Telegr. (ed. 5) viii. 258 Siemens-Halske Relay. This relay is developed from the original Siemen's [sic] relay.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) IV. 476/2 If the same current flows through all coils in series, as in the early Siemen's [sic] electrodynamometer.., the instrument can be calibrated as an ammeter.