48
Even the machine cancellation, doubtless used in some large centre of naval concentration, has had bars (or type turned base upwards) in lieu of the lettering and date (Fig. 49).
49. Machine Cancellation (Navy).
Other naval marks introduced in the present campaign, in accordance no doubt with a secret code, are in various devices, such as a propeller, a target, and various arrangements of rings, etc. (Figs. 50-57).
50 51 52
