Instrumenter

Fig. 31. Nivelleringsinstruinent. AB Sigtelinie.; Fig. 32. Aræometer. AB Skala, inddelt i Grader, BC den udblæste Del, D Belastning, for at Instrumentet skal flyde sikkert.

Fig. 157. Lysstraalernes Gang i et Teleskop

Fig. 37

Fig. 9. ELECTRIC CIRCUITS ON LOCOMOTIVE AND CARS. These circuits were used in connection with the test instruments