Miscellaneous Early Wireless
- The modern amateur wireless station
- Halcun Spark Transmitter advertisement
- Fischer 1 kw spark gap
- Early 1/2" Electroimporting Company (?) spark coil
- Early (1924) ARRL Membership Certificate Note: signature of Hiram Percy Maxim (T.O.M) on this
- 1910 bicycle mobile spark set, from Modern Electrics
- Shipboard arc converter installation, ca. 1922
- Shipboard spark set installation, ca. 1922
- "impulse" type spark set installation, ca. 1922
