Letter from Alexander Muirhead, FRS, The Lodge, Shortlands, to James Mackenzie Davidson Returns to the question of the condenser. Confirms that a condenser retards the rate of charge on breaking the primary circuit and that one should get less effect with a condenser across the primary break when firing the pistol than without the condenser. Asks for Mackenzie Davidson's opinion on two possible titles for the new patent [relating to X-ray apparatus and rotary breaks]. 14 March 1902