OF SURGICAL AND MEDICAL INSTRUMENTS, ETC. 219 



FIG 



FIG. 2572. 



2582. Eye-lid Retractors (BOWMAN'S, CEITCHETT'S, PELLIEB'S, and ADAMS'S), each 



3 3 to 6 



2583. HEARING TEUMPETS, bronze and electro-plated, the latest improved, 3s., 6s., 9s., 



each, and upwards to ..... 2 10 



2584. EAR CORNETS, each ': . ^ . . . 2 to 10 6 



2585. CONVERSATION TUBES, covered with silk, plain and taper, in ivory and ebony 



mountings . V . . . 16 to 1 1 



2586. OPTHALMOSCOPE, of much importance, for viewing the interior and back surface 



of the eye . . . . 15 6 to 1 5 



2587. SPIROMETER (Dr. HUTCHINSON'S), for measuring the vital capacity of the lungs, 



with tables and instructions, complete . . . 4 4 



2588. Weighing and Measuring Machine^ to be used in conjunction with the above 



7 10 



2589. IMPROVED PORTABLE SPIROMETER, for measuring the capacity and power of 



respiration of the chest and lungs (jig. 2589). The principle of this new and 

 very beautiful instrument is that of the sensitive air meter No. 75, with a 

 special arrangement for directing the action of the breath direct upon the fan, 

 so that no portion of it is lost, the indications being thus rendered absolutely 

 uniform and correct. With this really portable instrument the profession can 

 with ease and certainty test the chest and lungs of their out-door patients, 

 whilst in many instances it is believed they will direct it to be used by the 

 patients themselves. In neat mahogany case, 6 inches by 4 inches 4 10 



2590. STETHOMETER (Dr. QUAIN'S), for determining the expansion of the chest, in 



watch case, for the pocket . . . . . 180 



5592. Laryngoscope (Dr. JOHNSON'S), in pocket case, may also be used as an excellent 



ophthalmoscope . . . . . . 1 12 



2593. DITTO (MACKENZIE'S) ..... 1 12 



