A brass bodied ballistic chronograph, the 27” plain tube inscribed 'Designed by Colonel Holden. Made by Pitkin and Co, London 1912, number 108', Boulenge type, with adjustable measuring capsules on a heavy levelling tripod base, the instrument used for ordnance and gunnery for the accurate measurement of the speed of ammunition projectiles, 75cm high, contained within a case bearing brass plaque inscribed 'Designed by Colonel Holden, Made by Pitkin and Co, London number 120', the case 81cm long, 36cm wide, 30cm high